Merge commit 'a2543ff80d2906bccda1a4e2fdbd9d8e7d147fb3'

src/block/Banner.php

@@ -99,7 +99,7 @@ class Banner extends Transparent{
 
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileBanner){
 			$this->baseColor = $tile->getBaseColor();
 			$this->setPatterns($tile->getPatterns());
@@ -108,7 +108,7 @@ class Banner extends Transparent{
 
 	public function writeStateToWorld() : void{
 		parent::writeStateToWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		assert($tile instanceof TileBanner);
 		$tile->setBaseColor($this->baseColor);
 		$tile->setPatterns($this->patterns);
@@ -171,7 +171,7 @@ class Banner extends Transparent{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::opposite($this->facing))->getId() === BlockLegacyIds::AIR){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/BaseRail.php

@@ -255,7 +255,7 @@ abstract class BaseRail extends Flowable{
 				if(isset($otherPossible[$otherSide])){
 					$otherConnections[] = $otherSide;
 					$other->setConnections($otherConnections);
-					$this->pos->getWorld()->setBlock($other->pos, $other);
+					$this->pos->getWorldNonNull()->setBlock($other->pos, $other);
 
 					$changed = true;
 					$thisConnections[] = $thisSide;
@@ -268,7 +268,7 @@ abstract class BaseRail extends Flowable{
 
 		if($changed){
 			$this->setConnections($thisConnections);
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		}
 	}
 
@@ -287,11 +287,11 @@ abstract class BaseRail extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}else{
 			foreach($this->connections as $connection){
 				if(($connection & self::FLAG_ASCEND) !== 0 and $this->getSide($connection & ~self::FLAG_ASCEND)->isTransparent()){
-					$this->pos->getWorld()->useBreakOn($this->pos);
+					$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 					break;
 				}
 			}

src/block/Bed.php

@@ -73,7 +73,7 @@ class Bed extends Transparent{
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
 		//read extra state information from the tile - this is an ugly hack
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileBed){
 			$this->color = $tile->getColor();
 		}
@@ -82,7 +82,7 @@ class Bed extends Transparent{
 	public function writeStateToWorld() : void{
 		parent::writeStateToWorld();
 		//extra block properties storage hack
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileBed){
 			$tile->setColor($this->color);
 		}
@@ -105,11 +105,11 @@ class Bed extends Transparent{
 
 	public function setOccupied(bool $occupied = true) : void{
 		$this->occupied = $occupied;
-		$this->pos->getWorld()->setBlock($this->pos, $this, false);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this, false);
 
 		if(($other = $this->getOtherHalf()) !== null){
 			$other->occupied = $occupied;
-			$this->pos->getWorld()->setBlock($other->pos, $other, false);
+			$this->pos->getWorldNonNull()->setBlock($other->pos, $other, false);
 		}
 	}
 
@@ -139,7 +139,7 @@ class Bed extends Transparent{
 				return true;
 			}
 
-			$time = $this->pos->getWorld()->getTimeOfDay();
+			$time = $this->pos->getWorldNonNull()->getTimeOfDay();
 
 			$isNight = ($time >= World::TIME_NIGHT and $time < World::TIME_SUNRISE);
 

src/block/Block.php

@@ -150,10 +150,10 @@ class Block{
 	}
 
 	public function writeStateToWorld() : void{
-		$this->pos->getWorld()->getChunkAtPosition($this->pos)->setFullBlock($this->pos->x & 0xf, $this->pos->y, $this->pos->z & 0xf, $this->getFullId());
+		$this->pos->getWorldNonNull()->getChunkAtPosition($this->pos)->setFullBlock($this->pos->x & 0xf, $this->pos->y, $this->pos->z & 0xf, $this->getFullId());
 
 		$tileType = $this->idInfo->getTileClass();
-		$oldTile = $this->pos->getWorld()->getTile($this->pos);
+		$oldTile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($oldTile !== null){
 			if($tileType === null or !($oldTile instanceof $tileType)){
 				$oldTile->close();
@@ -163,7 +163,7 @@ class Block{
 			}
 		}
 		if($oldTile === null and $tileType !== null){
-			$this->pos->getWorld()->addTile(TileFactory::create($tileType, $this->pos->getWorld(), $this->pos->asVector3()));
+			$this->pos->getWorldNonNull()->addTile(TileFactory::create($tileType, $this->pos->getWorld(), $this->pos->asVector3()));
 		}
 	}
 
@@ -222,10 +222,10 @@ class Block{
 	 * Do the actions needed so the block is broken with the Item
 	 */
 	public function onBreak(Item $item, ?Player $player = null) : bool{
-		if(($t = $this->pos->getWorld()->getTile($this->pos)) !== null){
+		if(($t = $this->pos->getWorldNonNull()->getTile($this->pos)) !== null){
 			$t->onBlockDestroyed();
 		}
-		$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::AIR());
+		$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::AIR());
 		return true;
 	}
 
@@ -418,7 +418,7 @@ class Block{
 	public function getPickedItem(bool $addUserData = false) : Item{
 		$item = $this->asItem();
 		if($addUserData){
-			$tile = $this->pos->getWorld()->getTile($this->pos);
+			$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 			if($tile instanceof Tile){
 				$nbt = $tile->getCleanedNBT();
 				if($nbt instanceof CompoundTag){
@@ -480,7 +480,7 @@ class Block{
 	 */
 	public function getSide(int $side, int $step = 1){
 		if($this->pos->isValid()){
-			return $this->pos->getWorld()->getBlock($this->pos->getSide($side, $step));
+			return $this->pos->getWorldNonNull()->getBlock($this->pos->getSide($side, $step));
 		}
 
 		throw new \InvalidStateException("Block does not have a valid world");

src/block/BrewingStand.php

@@ -60,7 +60,7 @@ class BrewingStand extends Transparent{
 
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($player instanceof Player){
-			$stand = $this->pos->getWorld()->getTile($this->pos);
+			$stand = $this->pos->getWorldNonNull()->getTile($this->pos);
 			if($stand instanceof TileBrewingStand and $stand->canOpenWith($item->getCustomName())){
 				$player->setCurrentWindow($stand->getInventory());
 			}

src/block/Button.php

@@ -64,9 +64,9 @@ abstract class Button extends Flowable{
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if(!$this->powered){
 			$this->powered = true;
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
-			$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, $this->getActivationTime());
+			$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, $this->getActivationTime());
-			$this->pos->getWorld()->addSound($this->pos->add(0.5, 0.5, 0.5), new RedstonePowerOnSound());
+			$this->pos->getWorldNonNull()->addSound($this->pos->add(0.5, 0.5, 0.5), new RedstonePowerOnSound());
 		}
 
 		return true;
@@ -75,8 +75,8 @@ abstract class Button extends Flowable{
 	public function onScheduledUpdate() : void{
 		if($this->powered){
 			$this->powered = false;
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
-			$this->pos->getWorld()->addSound($this->pos->add(0.5, 0.5, 0.5), new RedstonePowerOffSound());
+			$this->pos->getWorldNonNull()->addSound($this->pos->add(0.5, 0.5, 0.5), new RedstonePowerOffSound());
 		}
 	}
 }

src/block/Cactus.php

@@ -76,12 +76,12 @@ class Cactus extends Transparent{
 	public function onNearbyBlockChange() : void{
 		$down = $this->getSide(Facing::DOWN);
 		if($down->getId() !== BlockLegacyIds::SAND and !$down->isSameType($this)){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}else{
 			foreach(Facing::HORIZONTAL as $side){
 				$b = $this->getSide($side);
 				if($b->isSolid()){
-					$this->pos->getWorld()->useBreakOn($this->pos);
+					$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 					break;
 				}
 			}
@@ -96,23 +96,23 @@ class Cactus extends Transparent{
 		if(!$this->getSide(Facing::DOWN)->isSameType($this)){
 			if($this->age === 15){
 				for($y = 1; $y < 3; ++$y){
-					$b = $this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y + $y, $this->pos->z);
+					$b = $this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y + $y, $this->pos->z);
 					if($b->getId() === BlockLegacyIds::AIR){
 						$ev = new BlockGrowEvent($b, VanillaBlocks::CACTUS());
 						$ev->call();
 						if($ev->isCancelled()){
 							break;
 						}
-						$this->pos->getWorld()->setBlock($b->pos, $ev->getNewState());
+						$this->pos->getWorldNonNull()->setBlock($b->pos, $ev->getNewState());
 					}else{
 						break;
 					}
 				}
 				$this->age = 0;
-				$this->pos->getWorld()->setBlock($this->pos, $this);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 			}else{
 				++$this->age;
-				$this->pos->getWorld()->setBlock($this->pos, $this);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 			}
 		}
 	}

src/block/Cake.php

@@ -78,7 +78,7 @@ class Cake extends Transparent implements FoodSource{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->getId() === BlockLegacyIds::AIR){ //Replace with common break method
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::AIR());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::AIR());
 		}
 	}
 
@@ -131,6 +131,6 @@ class Cake extends Transparent implements FoodSource{
 	}
 
 	public function onConsume(Living $consumer) : void{
-		$this->pos->getWorld()->setBlock($this->pos, $this->getResidue());
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this->getResidue());
 	}
 }

src/block/Carpet.php

@@ -58,7 +58,7 @@ class Carpet extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->getId() === BlockLegacyIds::AIR){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/Chest.php

@@ -70,7 +70,7 @@ class Chest extends Transparent{
 	}
 
 	public function onPostPlace() : void{
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileChest){
 			foreach([
 				Facing::rotateY($this->facing, true),
@@ -78,7 +78,7 @@ class Chest extends Transparent{
 			] as $side){
 				$c = $this->getSide($side);
 				if($c instanceof Chest and $c->isSameType($this) and $c->facing === $this->facing){
-					$pair = $this->pos->getWorld()->getTile($c->pos);
+					$pair = $this->pos->getWorldNonNull()->getTile($c->pos);
 					if($pair instanceof TileChest and !$pair->isPaired()){
 						$pair->pairWith($tile);
 						$tile->pairWith($pair);
@@ -92,7 +92,7 @@ class Chest extends Transparent{
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($player instanceof Player){
 
-			$chest = $this->pos->getWorld()->getTile($this->pos);
+			$chest = $this->pos->getWorldNonNull()->getTile($this->pos);
 			if($chest instanceof TileChest){
 				if(
 					!$this->getSide(Facing::UP)->isTransparent() or

src/block/CoarseDirt.php

@@ -34,7 +34,7 @@ class CoarseDirt extends Dirt{
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($face === Facing::UP and $item instanceof Hoe){
 			$item->applyDamage(1);
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::DIRT());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::DIRT());
 			return true;
 		}
 

src/block/CocoaBlock.php

@@ -89,7 +89,7 @@ class CocoaBlock extends Transparent{
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($this->age < 2 and $item instanceof Fertilizer){
 			$this->age++;
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 
 			$item->pop();
 
@@ -102,7 +102,7 @@ class CocoaBlock extends Transparent{
 	public function onNearbyBlockChange() : void{
 		$side = $this->getSide(Facing::opposite($this->facing));
 		if(!($side instanceof Wood) or !$side->getTreeType()->equals(TreeType::JUNGLE())){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 
@@ -113,7 +113,7 @@ class CocoaBlock extends Transparent{
 	public function onRandomTick() : void{
 		if($this->age < 2 and mt_rand(1, 5) === 1){
 			$this->age++;
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		}
 	}
 

src/block/ConcretePowder.php

@@ -38,7 +38,7 @@ class ConcretePowder extends Opaque implements Fallable{
 
 	public function onNearbyBlockChange() : void{
 		if(($block = $this->checkAdjacentWater()) !== null){
-			$this->pos->getWorld()->setBlock($this->pos, $block);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $block);
 		}else{
 			$this->startFalling();
 		}

src/block/Crops.php

@@ -72,7 +72,7 @@ abstract class Crops extends Flowable{
 			$ev = new BlockGrowEvent($this, $block);
 			$ev->call();
 			if(!$ev->isCancelled()){
-				$this->pos->getWorld()->setBlock($this->pos, $ev->getNewState());
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $ev->getNewState());
 			}
 
 			$item->pop();
@@ -85,7 +85,7 @@ abstract class Crops extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->getId() !== BlockLegacyIds::FARMLAND){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 
@@ -100,7 +100,7 @@ abstract class Crops extends Flowable{
 			$ev = new BlockGrowEvent($this, $block);
 			$ev->call();
 			if(!$ev->isCancelled()){
-				$this->pos->getWorld()->setBlock($this->pos, $ev->getNewState());
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $ev->getNewState());
 			}
 		}
 	}

src/block/DaylightSensor.php

@@ -91,7 +91,7 @@ class DaylightSensor extends Transparent{
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		$this->inverted = !$this->inverted;
 		$this->power = $this->recalculatePower();
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		return true;
 	}
 
@@ -99,18 +99,18 @@ class DaylightSensor extends Transparent{
 		$newPower = $this->recalculatePower();
 		if($this->power !== $newPower){
 			$this->power = $newPower;
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		}
-		$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, 20);
+		$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, 20);
 	}
 
 	private function recalculatePower() : int{
-		$lightLevel = $this->pos->getWorld()->getRealBlockSkyLightAt($this->pos->x, $this->pos->y, $this->pos->z);
+		$lightLevel = $this->pos->getWorldNonNull()->getRealBlockSkyLightAt($this->pos->x, $this->pos->y, $this->pos->z);
 		if($this->inverted){
 			return 15 - $lightLevel;
 		}
 
-		$sunAngle = $this->pos->getWorld()->getSunAnglePercentage();
+		$sunAngle = $this->pos->getWorldNonNull()->getSunAnglePercentage();
 		return max(0, (int) round($lightLevel * cos(($sunAngle + ((($sunAngle < 0.5 ? 0 : 1) - $sunAngle) / 5)) * 2 * M_PI)));
 	}
 

src/block/DeadBush.php

@@ -47,7 +47,7 @@ class DeadBush extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/Dirt.php

@@ -38,7 +38,7 @@ class Dirt extends Opaque{
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($face === Facing::UP and $item instanceof Hoe){
 			$item->applyDamage(1);
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::FARMLAND());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::FARMLAND());
 
 			return true;
 		}

src/block/Door.php

@@ -99,7 +99,7 @@ class Door extends Transparent{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->getId() === BlockLegacyIds::AIR){ //Replace with common break method
-			$this->pos->getWorld()->useBreakOn($this->pos); //this will delete both halves if they exist
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos); //this will delete both halves if they exist
 		}
 	}
 
@@ -138,11 +138,11 @@ class Door extends Transparent{
 		$other = $this->getSide($this->top ? Facing::DOWN : Facing::UP);
 		if($other instanceof Door and $other->isSameType($this)){
 			$other->open = $this->open;
-			$this->pos->getWorld()->setBlock($other->pos, $other);
+			$this->pos->getWorldNonNull()->setBlock($other->pos, $other);
 		}
 
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
-		$this->pos->getWorld()->addSound($this->pos, new DoorSound());
+		$this->pos->getWorldNonNull()->addSound($this->pos, new DoorSound());
 
 		return true;
 	}

src/block/DoublePlant.php

@@ -77,7 +77,7 @@ class DoublePlant extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if(!$this->isValidHalfPlant() or (!$this->top and $this->getSide(Facing::DOWN)->isTransparent())){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/DragonEgg.php

@@ -63,7 +63,7 @@ class DragonEgg extends Transparent implements Fallable{
 
 	public function teleport() : void{
 		for($tries = 0; $tries < 16; ++$tries){
-			$block = $this->pos->getWorld()->getBlockAt(
+			$block = $this->pos->getWorldNonNull()->getBlockAt(
 				$this->pos->x + mt_rand(-16, 16),
 				max(0, min(World::Y_MAX - 1, $this->pos->y + mt_rand(-8, 8))),
 				$this->pos->z + mt_rand(-16, 16)
@@ -76,9 +76,9 @@ class DragonEgg extends Transparent implements Fallable{
 				}
 
 				$blockPos = $ev->getTo();
-				$this->pos->getWorld()->addParticle($this->pos, new DragonEggTeleportParticle($this->pos->x - $blockPos->x, $this->pos->y - $blockPos->y, $this->pos->z - $blockPos->z));
+				$this->pos->getWorldNonNull()->addParticle($this->pos, new DragonEggTeleportParticle($this->pos->x - $blockPos->x, $this->pos->y - $blockPos->y, $this->pos->z - $blockPos->z));
-				$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::AIR());
+				$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::AIR());
-				$this->pos->getWorld()->setBlock($blockPos, $this);
+				$this->pos->getWorldNonNull()->setBlock($blockPos, $this);
 				break;
 			}
 		}

src/block/EnderChest.php

@@ -75,7 +75,7 @@ class EnderChest extends Transparent{
 
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($player instanceof Player){
-			$enderChest = $this->pos->getWorld()->getTile($this->pos);
+			$enderChest = $this->pos->getWorldNonNull()->getTile($this->pos);
 			if($enderChest instanceof TileEnderChest and $this->getSide(Facing::UP)->isTransparent()){
 				$player->getEnderChestInventory()->setHolderPosition($this->pos);
 				$player->setCurrentWindow($player->getEnderChestInventory());

src/block/Farmland.php

@@ -58,7 +58,7 @@ class Farmland extends Transparent{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::UP)->isSolid()){
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::DIRT());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::DIRT());
 		}
 	}
 
@@ -70,13 +70,13 @@ class Farmland extends Transparent{
 		if(!$this->canHydrate()){
 			if($this->wetness > 0){
 				$this->wetness--;
-				$this->pos->getWorld()->setBlock($this->pos, $this, false);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this, false);
 			}else{
-				$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::DIRT());
+				$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::DIRT());
 			}
 		}elseif($this->wetness < 7){
 			$this->wetness = 7;
-			$this->pos->getWorld()->setBlock($this->pos, $this, false);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this, false);
 		}
 	}
 
@@ -87,7 +87,7 @@ class Farmland extends Transparent{
 		for($y = $start->y; $y <= $end->y; ++$y){
 			for($z = $start->z; $z <= $end->z; ++$z){
 				for($x = $start->x; $x <= $end->x; ++$x){
-					if($this->pos->getWorld()->getBlockAt($x, $y, $z) instanceof Water){
+					if($this->pos->getWorldNonNull()->getBlockAt($x, $y, $z) instanceof Water){
 						return true;
 					}
 				}

src/block/FenceGate.php

@@ -88,7 +88,7 @@ class FenceGate extends Transparent{
 		$inWall = $this->checkInWall();
 		if($inWall !== $this->inWall){
 			$this->inWall = $inWall;
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		}
 	}
 
@@ -101,8 +101,8 @@ class FenceGate extends Transparent{
 			}
 		}
 
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
-		$this->pos->getWorld()->addSound($this->pos, new DoorSound());
+		$this->pos->getWorldNonNull()->addSound($this->pos, new DoorSound());
 		return true;
 	}
 

src/block/Fire.php

@@ -88,9 +88,9 @@ class Fire extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if(!$this->getSide(Facing::DOWN)->isSolid() and !$this->hasAdjacentFlammableBlocks()){
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::AIR());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::AIR());
 		}else{
-			$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, mt_rand(30, 40));
+			$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, mt_rand(30, 40));
 		}
 	}
 
@@ -124,10 +124,10 @@ class Fire extends Flowable{
 		}
 
 		if($result !== null){
-			$this->pos->getWorld()->setBlock($this->pos, $result);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $result);
 		}
 
-		$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, mt_rand(30, 40));
+		$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, mt_rand(30, 40));
 
 		if($canSpread){
 			//TODO: raise upper bound for chance in humid biomes
@@ -168,9 +168,9 @@ class Fire extends Flowable{
 				if(mt_rand(0, $this->age + 9) < 5){ //TODO: check rain
 					$fire = clone $this;
 					$fire->age = min(15, $fire->age + (mt_rand(0, 4) >> 2));
-					$this->pos->getWorld()->setBlock($block->pos, $fire);
+					$this->pos->getWorldNonNull()->setBlock($block->pos, $fire);
 				}else{
-					$this->pos->getWorld()->setBlock($block->pos, VanillaBlocks::AIR());
+					$this->pos->getWorldNonNull()->setBlock($block->pos, VanillaBlocks::AIR());
 				}
 			}
 		}

src/block/Flower.php

@@ -46,7 +46,7 @@ class Flower extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/FlowerPot.php

@@ -61,7 +61,7 @@ class FlowerPot extends Flowable{
 
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileFlowerPot){
 			$this->setPlant($tile->getPlant());
 		}else{
@@ -72,7 +72,7 @@ class FlowerPot extends Flowable{
 	public function writeStateToWorld() : void{
 		parent::writeStateToWorld();
 
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		assert($tile instanceof TileFlowerPot);
 		$tile->setPlant($this->plant);
 	}
@@ -122,7 +122,7 @@ class FlowerPot extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 
@@ -134,7 +134,7 @@ class FlowerPot extends Flowable{
 
 		$this->setPlant($plant);
 		$item->pop();
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 
 		return true;
 	}

src/block/FrostedIce.php

@@ -50,17 +50,17 @@ class FrostedIce extends Ice{
 
 	public function onNearbyBlockChange() : void{
 		if(!$this->checkAdjacentBlocks(2)){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}else{
-			$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, mt_rand(20, 40));
+			$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, mt_rand(20, 40));
 		}
 	}
 
 	public function onRandomTick() : void{
 		if((!$this->checkAdjacentBlocks(4) or mt_rand(0, 2) === 0) and
 			max( //TODO: move this to World
-				$this->pos->getWorld()->getHighestAdjacentBlockLight($this->pos->x, $this->pos->y, $this->pos->z),
+				$this->pos->getWorldNonNull()->getHighestAdjacentBlockLight($this->pos->x, $this->pos->y, $this->pos->z),
-				$this->pos->getWorld()->getHighestAdjacentBlockSkyLight($this->pos->x, $this->pos->y, $this->pos->z) - $this->pos->getWorld()->getSkyLightReduction()
+				$this->pos->getWorldNonNull()->getHighestAdjacentBlockSkyLight($this->pos->x, $this->pos->y, $this->pos->z) - $this->pos->getWorldNonNull()->getSkyLightReduction()
 			) >= 12 - $this->age){
 			if($this->tryMelt()){
 				foreach($this->getAllSides() as $block){
@@ -70,7 +70,7 @@ class FrostedIce extends Ice{
 				}
 			}
 		}else{
-			$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, mt_rand(20, 40));
+			$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, mt_rand(20, 40));
 		}
 	}
 
@@ -86,7 +86,7 @@ class FrostedIce extends Ice{
 					continue;
 				}
 				if(
-					$this->pos->getWorld()->getBlockAt($this->pos->x + $x, $this->pos->y, $this->pos->z + $z) instanceof FrostedIce and
+					$this->pos->getWorldNonNull()->getBlockAt($this->pos->x + $x, $this->pos->y, $this->pos->z + $z) instanceof FrostedIce and
 					++$found >= $requirement
 				){
 					return true;
@@ -103,13 +103,13 @@ class FrostedIce extends Ice{
 	 */
 	private function tryMelt() : bool{
 		if($this->age >= 3){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 			return true;
 		}
 
 		$this->age++;
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
-		$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, mt_rand(20, 40));
+		$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, mt_rand(20, 40));
 		return false;
 	}
 }

src/block/Furnace.php

@@ -88,7 +88,7 @@ class Furnace extends Opaque{
 
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($player instanceof Player){
-			$furnace = $this->pos->getWorld()->getTile($this->pos);
+			$furnace = $this->pos->getWorldNonNull()->getTile($this->pos);
 			if($furnace instanceof TileFurnace and $furnace->canOpenWith($item->getCustomName())){
 				$player->setCurrentWindow($furnace->getInventory());
 			}
@@ -98,9 +98,9 @@ class Furnace extends Opaque{
 	}
 
 	public function onScheduledUpdate() : void{
-		$furnace = $this->pos->getWorld()->getTile($this->pos);
+		$furnace = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($furnace instanceof TileFurnace and $furnace->onUpdate()){
-			$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, 1); //TODO: check this
+			$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, 1); //TODO: check this
 		}
 	}
 }

src/block/Grass.php

@@ -52,13 +52,13 @@ class Grass extends Opaque{
 	}
 
 	public function onRandomTick() : void{
-		$lightAbove = $this->pos->getWorld()->getFullLightAt($this->pos->x, $this->pos->y + 1, $this->pos->z);
+		$lightAbove = $this->pos->getWorldNonNull()->getFullLightAt($this->pos->x, $this->pos->y + 1, $this->pos->z);
-		if($lightAbove < 4 and $this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y + 1, $this->pos->z)->getLightFilter() >= 2){
+		if($lightAbove < 4 and $this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y + 1, $this->pos->z)->getLightFilter() >= 2){
 			//grass dies
 			$ev = new BlockSpreadEvent($this, $this, VanillaBlocks::DIRT());
 			$ev->call();
 			if(!$ev->isCancelled()){
-				$this->pos->getWorld()->setBlock($this->pos, $ev->getNewState(), false);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $ev->getNewState(), false);
 			}
 		}elseif($lightAbove >= 9){
 			//try grass spread
@@ -67,12 +67,12 @@ class Grass extends Opaque{
 				$y = mt_rand($this->pos->y - 3, $this->pos->y + 1);
 				$z = mt_rand($this->pos->z - 1, $this->pos->z + 1);
 
-				$b = $this->pos->getWorld()->getBlockAt($x, $y, $z);
+				$b = $this->pos->getWorldNonNull()->getBlockAt($x, $y, $z);
 				if(
 					!($b instanceof Dirt) or
 					$b instanceof CoarseDirt or
-					$this->pos->getWorld()->getFullLightAt($x, $y + 1, $z) < 4 or
+					$this->pos->getWorldNonNull()->getFullLightAt($x, $y + 1, $z) < 4 or
-					$this->pos->getWorld()->getBlockAt($x, $y + 1, $z)->getLightFilter() >= 2
+					$this->pos->getWorldNonNull()->getBlockAt($x, $y + 1, $z)->getLightFilter() >= 2
 				){
 					continue;
 				}
@@ -80,7 +80,7 @@ class Grass extends Opaque{
 				$ev = new BlockSpreadEvent($b, $this, VanillaBlocks::GRASS());
 				$ev->call();
 				if(!$ev->isCancelled()){
-					$this->pos->getWorld()->setBlock($b->pos, $ev->getNewState(), false);
+					$this->pos->getWorldNonNull()->setBlock($b->pos, $ev->getNewState(), false);
 				}
 			}
 		}
@@ -92,17 +92,17 @@ class Grass extends Opaque{
 		}
 		if($item instanceof Fertilizer){
 			$item->pop();
-			TallGrassObject::growGrass($this->pos->getWorld(), $this->pos, new Random(mt_rand()), 8, 2);
+			TallGrassObject::growGrass($this->pos->getWorldNonNull(), $this->pos, new Random(mt_rand()), 8, 2);
 
 			return true;
 		}elseif($item instanceof Hoe){
 			$item->applyDamage(1);
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::FARMLAND());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::FARMLAND());
 
 			return true;
 		}elseif($item instanceof Shovel and $this->getSide(Facing::UP)->getId() === BlockLegacyIds::AIR){
 			$item->applyDamage(1);
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::GRASS_PATH());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::GRASS_PATH());
 
 			return true;
 		}

src/block/GrassPath.php

@@ -42,7 +42,7 @@ class GrassPath extends Transparent{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::UP)->isSolid()){
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::DIRT());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::DIRT());
 		}
 	}
 

src/block/Hopper.php

@@ -76,7 +76,7 @@ class Hopper extends Transparent{
 
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($player !== null){
-			$tile = $this->pos->getWorld()->getTile($this->pos);
+			$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 			if($tile instanceof TileHopper){ //TODO: find a way to have inventories open on click without this boilerplate in every block
 				$player->setCurrentWindow($tile->getInventory());
 			}

src/block/Ice.php

@@ -43,7 +43,7 @@ class Ice extends Transparent{
 
 	public function onBreak(Item $item, ?Player $player = null) : bool{
 		if(($player === null or $player->isSurvival()) and !$item->hasEnchantment(Enchantment::SILK_TOUCH())){
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::WATER());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::WATER());
 			return true;
 		}
 		return parent::onBreak($item, $player);
@@ -54,8 +54,8 @@ class Ice extends Transparent{
 	}
 
 	public function onRandomTick() : void{
-		if($this->pos->getWorld()->getHighestAdjacentBlockLight($this->pos->x, $this->pos->y, $this->pos->z) >= 12){
+		if($this->pos->getWorldNonNull()->getHighestAdjacentBlockLight($this->pos->x, $this->pos->y, $this->pos->z) >= 12){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/ItemFrame.php

@@ -61,7 +61,7 @@ class ItemFrame extends Flowable{
 
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileItemFrame){
 			$this->framedItem = $tile->getItem();
 			if($this->framedItem->isNull()){
@@ -74,7 +74,7 @@ class ItemFrame extends Flowable{
 
 	public function writeStateToWorld() : void{
 		parent::writeStateToWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileItemFrame){
 			$tile->setItem($this->framedItem);
 			$tile->setItemRotation($this->itemRotation);
@@ -132,7 +132,7 @@ class ItemFrame extends Flowable{
 			return true;
 		}
 
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 
 		return true;
 	}
@@ -142,16 +142,16 @@ class ItemFrame extends Flowable{
 			return false;
 		}
 		if(lcg_value() <= $this->itemDropChance){
-			$this->pos->getWorld()->dropItem($this->pos->add(0.5, 0.5, 0.5), $this->getFramedItem());
+			$this->pos->getWorldNonNull()->dropItem($this->pos->add(0.5, 0.5, 0.5), $this->getFramedItem());
 		}
 		$this->setFramedItem(null);
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		return true;
 	}
 
 	public function onNearbyBlockChange() : void{
 		if(!$this->getSide(Facing::opposite($this->facing))->isSolid()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/Ladder.php

@@ -90,7 +90,7 @@ class Ladder extends Transparent{
 
 	public function onNearbyBlockChange() : void{
 		if(!$this->getSide(Facing::opposite($this->facing))->isSolid()){ //Replace with common break method
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 }

src/block/Lantern.php

@@ -69,17 +69,17 @@ class Lantern extends Transparent{
 	}
 
 	public function place(BlockTransaction $tx, Item $item, Block $blockReplace, Block $blockClicked, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
-		if(!$this->canAttachTo($this->pos->getWorld()->getBlock($blockReplace->getPos()->up())) and !$this->canAttachTo($this->pos->getWorld()->getBlock($blockReplace->getPos()->down()))){
+		if(!$this->canAttachTo($this->pos->getWorldNonNull()->getBlock($blockReplace->getPos()->up())) and !$this->canAttachTo($this->pos->getWorldNonNull()->getBlock($blockReplace->getPos()->down()))){
 			return false;
 		}
 
-		$this->hanging = ($face === Facing::DOWN or !$this->canAttachTo($this->pos->getWorld()->getBlock($blockReplace->getPos()->down())));
+		$this->hanging = ($face === Facing::DOWN or !$this->canAttachTo($this->pos->getWorldNonNull()->getBlock($blockReplace->getPos()->down())));
 		return parent::place($tx, $item, $blockReplace, $blockClicked, $face, $clickVector, $player);
 	}
 
 	public function onNearbyBlockChange() : void{
-		if(!$this->canAttachTo($this->pos->getWorld()->getBlock($this->hanging ? $this->pos->up() : $this->pos->down()))){
+		if(!$this->canAttachTo($this->pos->getWorldNonNull()->getBlock($this->hanging ? $this->pos->up() : $this->pos->down()))){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 }

src/block/Leaves.php

@@ -78,7 +78,7 @@ class Leaves extends Transparent{
 		}
 		$visited[$index] = true;
 
-		$block = $this->pos->getWorld()->getBlock($pos);
+		$block = $this->pos->getWorldNonNull()->getBlock($pos);
 		if($block instanceof Wood){ //type doesn't matter
 			return true;
 		}
@@ -97,7 +97,7 @@ class Leaves extends Transparent{
 	public function onNearbyBlockChange() : void{
 		if(!$this->noDecay and !$this->checkDecay){
 			$this->checkDecay = true;
-			$this->pos->getWorld()->setBlock($this->pos, $this, false);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this, false);
 		}
 	}
 
@@ -111,9 +111,9 @@ class Leaves extends Transparent{
 			$ev->call();
 			if($ev->isCancelled() or $this->findLog($this->pos)){
 				$this->checkDecay = false;
-				$this->pos->getWorld()->setBlock($this->pos, $this, false);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this, false);
 			}else{
-				$this->pos->getWorld()->useBreakOn($this->pos);
+				$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 			}
 		}
 	}

src/block/Lever.php

@@ -107,14 +107,14 @@ class Lever extends Flowable{
 		}
 
 		if(!$this->getSide($face)->isSolid()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		$this->powered = !$this->powered;
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
-		$this->pos->getWorld()->addSound(
+		$this->pos->getWorldNonNull()->addSound(
 			$this->pos->add(0.5, 0.5, 0.5),
 			$this->powered ? new RedstonePowerOnSound() : new RedstonePowerOffSound()
 		);

src/block/Liquid.php

@@ -188,7 +188,7 @@ abstract class Liquid extends Transparent{
 				++$z;
 			}
 
-			$sideBlock = $this->pos->getWorld()->getBlockAt($x, $y, $z);
+			$sideBlock = $this->pos->getWorldNonNull()->getBlockAt($x, $y, $z);
 			$blockDecay = $this->getEffectiveFlowDecay($sideBlock);
 
 			if($blockDecay < 0){
@@ -196,7 +196,7 @@ abstract class Liquid extends Transparent{
 					continue;
 				}
 
-				$blockDecay = $this->getEffectiveFlowDecay($this->pos->getWorld()->getBlockAt($x, $y - 1, $z));
+				$blockDecay = $this->getEffectiveFlowDecay($this->pos->getWorldNonNull()->getBlockAt($x, $y - 1, $z));
 
 				if($blockDecay >= 0){
 					$realDecay = $blockDecay - ($decay - 8);
@@ -216,14 +216,14 @@ abstract class Liquid extends Transparent{
 
 		if($this->falling){
 			if(
-				!$this->canFlowInto($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z - 1)) or
+				!$this->canFlowInto($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z - 1)) or
-				!$this->canFlowInto($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z + 1)) or
+				!$this->canFlowInto($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z + 1)) or
-				!$this->canFlowInto($this->pos->getWorld()->getBlockAt($this->pos->x - 1, $this->pos->y, $this->pos->z)) or
+				!$this->canFlowInto($this->pos->getWorldNonNull()->getBlockAt($this->pos->x - 1, $this->pos->y, $this->pos->z)) or
-				!$this->canFlowInto($this->pos->getWorld()->getBlockAt($this->pos->x + 1, $this->pos->y, $this->pos->z)) or
+				!$this->canFlowInto($this->pos->getWorldNonNull()->getBlockAt($this->pos->x + 1, $this->pos->y, $this->pos->z)) or
-				!$this->canFlowInto($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y + 1, $this->pos->z - 1)) or
+				!$this->canFlowInto($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y + 1, $this->pos->z - 1)) or
-				!$this->canFlowInto($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y + 1, $this->pos->z + 1)) or
+				!$this->canFlowInto($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y + 1, $this->pos->z + 1)) or
-				!$this->canFlowInto($this->pos->getWorld()->getBlockAt($this->pos->x - 1, $this->pos->y + 1, $this->pos->z)) or
+				!$this->canFlowInto($this->pos->getWorldNonNull()->getBlockAt($this->pos->x - 1, $this->pos->y + 1, $this->pos->z)) or
-				!$this->canFlowInto($this->pos->getWorld()->getBlockAt($this->pos->x + 1, $this->pos->y + 1, $this->pos->z))
+				!$this->canFlowInto($this->pos->getWorldNonNull()->getBlockAt($this->pos->x + 1, $this->pos->y + 1, $this->pos->z))
 			){
 				$vector = $vector->normalize()->add(0, -6, 0);
 			}
@@ -252,7 +252,7 @@ abstract class Liquid extends Transparent{
 
 	public function onNearbyBlockChange() : void{
 		$this->checkForHarden();
-		$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, $this->tickRate());
+		$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, $this->tickRate());
 	}
 
 	public function onScheduledUpdate() : void{
@@ -261,10 +261,10 @@ abstract class Liquid extends Transparent{
 		if(!$this->isSource()){
 			$smallestFlowDecay = -100;
 			$this->adjacentSources = 0;
-			$smallestFlowDecay = $this->getSmallestFlowDecay($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z - 1), $smallestFlowDecay);
+			$smallestFlowDecay = $this->getSmallestFlowDecay($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z - 1), $smallestFlowDecay);
-			$smallestFlowDecay = $this->getSmallestFlowDecay($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z + 1), $smallestFlowDecay);
+			$smallestFlowDecay = $this->getSmallestFlowDecay($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z + 1), $smallestFlowDecay);
-			$smallestFlowDecay = $this->getSmallestFlowDecay($this->pos->getWorld()->getBlockAt($this->pos->x - 1, $this->pos->y, $this->pos->z), $smallestFlowDecay);
+			$smallestFlowDecay = $this->getSmallestFlowDecay($this->pos->getWorldNonNull()->getBlockAt($this->pos->x - 1, $this->pos->y, $this->pos->z), $smallestFlowDecay);
-			$smallestFlowDecay = $this->getSmallestFlowDecay($this->pos->getWorld()->getBlockAt($this->pos->x + 1, $this->pos->y, $this->pos->z), $smallestFlowDecay);
+			$smallestFlowDecay = $this->getSmallestFlowDecay($this->pos->getWorldNonNull()->getBlockAt($this->pos->x + 1, $this->pos->y, $this->pos->z), $smallestFlowDecay);
 
 			$newDecay = $smallestFlowDecay + $multiplier;
 			$falling = false;
@@ -273,12 +273,12 @@ abstract class Liquid extends Transparent{
 				$newDecay = -1;
 			}
 
-			if($this->getEffectiveFlowDecay($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y + 1, $this->pos->z)) >= 0){
+			if($this->getEffectiveFlowDecay($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y + 1, $this->pos->z)) >= 0){
 				$falling = true;
 			}
 
 			if($this->adjacentSources >= 2 and $this instanceof Water){
-				$bottomBlock = $this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y - 1, $this->pos->z);
+				$bottomBlock = $this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y - 1, $this->pos->z);
 				if($bottomBlock->isSolid() or ($bottomBlock instanceof Water and $bottomBlock->isSource())){
 					$newDecay = 0;
 					$falling = false;
@@ -287,17 +287,17 @@ abstract class Liquid extends Transparent{
 
 			if($falling !== $this->falling or (!$falling and $newDecay !== $this->decay)){
 				if(!$falling and $newDecay < 0){
-					$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::AIR());
+					$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::AIR());
 					return;
 				}
 
 				$this->falling = $falling;
 				$this->decay = $falling ? 0 : $newDecay;
-				$this->pos->getWorld()->setBlock($this->pos, $this); //local block update will cause an update to be scheduled
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this); //local block update will cause an update to be scheduled
 			}
 		}
 
-		$bottomBlock = $this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y - 1, $this->pos->z);
+		$bottomBlock = $this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y - 1, $this->pos->z);
 
 		$this->flowIntoBlock($bottomBlock, 0, true);
 
@@ -312,19 +312,19 @@ abstract class Liquid extends Transparent{
 				$flags = $this->getOptimalFlowDirections();
 
 				if($flags[0]){
-					$this->flowIntoBlock($this->pos->getWorld()->getBlockAt($this->pos->x - 1, $this->pos->y, $this->pos->z), $adjacentDecay, false);
+					$this->flowIntoBlock($this->pos->getWorldNonNull()->getBlockAt($this->pos->x - 1, $this->pos->y, $this->pos->z), $adjacentDecay, false);
 				}
 
 				if($flags[1]){
-					$this->flowIntoBlock($this->pos->getWorld()->getBlockAt($this->pos->x + 1, $this->pos->y, $this->pos->z), $adjacentDecay, false);
+					$this->flowIntoBlock($this->pos->getWorldNonNull()->getBlockAt($this->pos->x + 1, $this->pos->y, $this->pos->z), $adjacentDecay, false);
 				}
 
 				if($flags[2]){
-					$this->flowIntoBlock($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z - 1), $adjacentDecay, false);
+					$this->flowIntoBlock($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z - 1), $adjacentDecay, false);
 				}
 
 				if($flags[3]){
-					$this->flowIntoBlock($this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z + 1), $adjacentDecay, false);
+					$this->flowIntoBlock($this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y, $this->pos->z + 1), $adjacentDecay, false);
 				}
 			}
 		}
@@ -342,10 +342,10 @@ abstract class Liquid extends Transparent{
 			$ev->call();
 			if(!$ev->isCancelled()){
 				if($block->getId() > 0){
-					$this->pos->getWorld()->useBreakOn($block->pos);
+					$this->pos->getWorldNonNull()->useBreakOn($block->pos);
 				}
 
-				$this->pos->getWorld()->setBlock($block->pos, $ev->getNewState());
+				$this->pos->getWorldNonNull()->setBlock($block->pos, $ev->getNewState());
 			}
 		}
 	}
@@ -373,10 +373,10 @@ abstract class Liquid extends Transparent{
 			}
 
 			if(!isset($this->flowCostVisited[$hash = World::blockHash($x, $y, $z)])){
-				$blockSide = $this->pos->getWorld()->getBlockAt($x, $y, $z);
+				$blockSide = $this->pos->getWorldNonNull()->getBlockAt($x, $y, $z);
 				if(!$this->canFlowInto($blockSide)){
 					$this->flowCostVisited[$hash] = self::BLOCKED;
-				}elseif($this->pos->getWorld()->getBlockAt($x, $y - 1, $z)->canBeFlowedInto()){
+				}elseif($this->pos->getWorldNonNull()->getBlockAt($x, $y - 1, $z)->canBeFlowedInto()){
 					$this->flowCostVisited[$hash] = self::CAN_FLOW_DOWN;
 				}else{
 					$this->flowCostVisited[$hash] = self::CAN_FLOW;
@@ -425,12 +425,12 @@ abstract class Liquid extends Transparent{
 			}elseif($j === 3){
 				++$z;
 			}
-			$block = $this->pos->getWorld()->getBlockAt($x, $y, $z);
+			$block = $this->pos->getWorldNonNull()->getBlockAt($x, $y, $z);
 
 			if(!$this->canFlowInto($block)){
 				$this->flowCostVisited[World::blockHash($x, $y, $z)] = self::BLOCKED;
 				continue;
-			}elseif($this->pos->getWorld()->getBlockAt($x, $y - 1, $z)->canBeFlowedInto()){
+			}elseif($this->pos->getWorldNonNull()->getBlockAt($x, $y - 1, $z)->canBeFlowedInto()){
 				$this->flowCostVisited[World::blockHash($x, $y, $z)] = self::CAN_FLOW_DOWN;
 				$flowCost[$j] = $maxCost = 0;
 			}elseif($maxCost > 0){
@@ -477,13 +477,13 @@ abstract class Liquid extends Transparent{
 		$ev = new BlockFormEvent($this, $result);
 		$ev->call();
 		if(!$ev->isCancelled()){
-			$this->pos->getWorld()->setBlock($this->pos, $ev->getNewState());
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $ev->getNewState());
-			$this->pos->getWorld()->addSound($this->pos->add(0.5, 0.5, 0.5), new FizzSound(2.6 + (lcg_value() - lcg_value()) * 0.8));
+			$this->pos->getWorldNonNull()->addSound($this->pos->add(0.5, 0.5, 0.5), new FizzSound(2.6 + (lcg_value() - lcg_value()) * 0.8));
 		}
 		return true;
 	}
 
 	protected function canFlowInto(Block $block) : bool{
-		return $this->pos->getWorld()->isInWorld($block->pos->x, $block->pos->y, $block->pos->z) and $block->canBeFlowedInto() and !($block instanceof Liquid and $block->isSource()); //TODO: I think this should only be liquids of the same type
+		return $this->pos->getWorldNonNull()->isInWorld($block->pos->x, $block->pos->y, $block->pos->z) and $block->canBeFlowedInto() and !($block instanceof Liquid and $block->isSource()); //TODO: I think this should only be liquids of the same type
 	}
 }

src/block/Mycelium.php

@@ -49,13 +49,13 @@ class Mycelium extends Opaque{
 		$x = mt_rand($this->pos->x - 1, $this->pos->x + 1);
 		$y = mt_rand($this->pos->y - 2, $this->pos->y + 2);
 		$z = mt_rand($this->pos->z - 1, $this->pos->z + 1);
-		$block = $this->pos->getWorld()->getBlockAt($x, $y, $z);
+		$block = $this->pos->getWorldNonNull()->getBlockAt($x, $y, $z);
 		if($block->getId() === BlockLegacyIds::DIRT){
 			if($block->getSide(Facing::UP) instanceof Transparent){
 				$ev = new BlockSpreadEvent($block, $this, VanillaBlocks::MYCELIUM());
 				$ev->call();
 				if(!$ev->isCancelled()){
-					$this->pos->getWorld()->setBlock($block->pos, $ev->getNewState());
+					$this->pos->getWorldNonNull()->setBlock($block->pos, $ev->getNewState());
 				}
 			}
 		}

src/block/NetherWartPlant.php

@@ -64,7 +64,7 @@ class NetherWartPlant extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->getId() !== BlockLegacyIds::SOUL_SAND){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 
@@ -79,7 +79,7 @@ class NetherWartPlant extends Flowable{
 			$ev = new BlockGrowEvent($this, $block);
 			$ev->call();
 			if(!$ev->isCancelled()){
-				$this->pos->getWorld()->setBlock($this->pos, $ev->getNewState());
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $ev->getNewState());
 			}
 		}
 	}

src/block/Note.php

@@ -39,7 +39,7 @@ class Note extends Opaque{
 
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileNote){
 			$this->pitch = $tile->getPitch();
 		}else{
@@ -49,7 +49,7 @@ class Note extends Opaque{
 
 	public function writeStateToWorld() : void{
 		parent::writeStateToWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		assert($tile instanceof TileNote);
 		$tile->setPitch($this->pitch);
 	}

src/block/RedMushroom.php

@@ -41,7 +41,7 @@ class RedMushroom extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/RedstoneComparator.php

@@ -72,7 +72,7 @@ class RedstoneComparator extends Flowable{
 
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof Comparator){
 			$this->signalStrength = $tile->getSignalStrength();
 		}
@@ -80,7 +80,7 @@ class RedstoneComparator extends Flowable{
 
 	public function writeStateToWorld() : void{
 		parent::writeStateToWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		assert($tile instanceof Comparator);
 		$tile->setSignalStrength($this->signalStrength);
 	}
@@ -143,13 +143,13 @@ class RedstoneComparator extends Flowable{
 
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		$this->isSubtractMode = !$this->isSubtractMode;
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		return true;
 	}
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/RedstoneOre.php

@@ -68,7 +68,7 @@ class RedstoneOre extends Opaque{
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if(!$this->lit){
 			$this->lit = true;
-			$this->pos->getWorld()->setBlock($this->pos, $this); //no return here - this shouldn't prevent block placement
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this); //no return here - this shouldn't prevent block placement
 		}
 		return false;
 	}
@@ -76,7 +76,7 @@ class RedstoneOre extends Opaque{
 	public function onNearbyBlockChange() : void{
 		if(!$this->lit){
 			$this->lit = true;
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		}
 	}
 
@@ -87,7 +87,7 @@ class RedstoneOre extends Opaque{
 	public function onRandomTick() : void{
 		if($this->lit){
 			$this->lit = false;
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		}
 	}
 

src/block/RedstoneRepeater.php

@@ -99,13 +99,13 @@ class RedstoneRepeater extends Flowable{
 		if(++$this->delay > 4){
 			$this->delay = 1;
 		}
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 		return true;
 	}
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/Sapling.php

@@ -69,7 +69,7 @@ class Sapling extends Flowable{
 
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		if($item instanceof Fertilizer){
-			Tree::growTree($this->pos->getWorld(), $this->pos->x, $this->pos->y, $this->pos->z, new Random(mt_rand()), $this->treeType);
+			Tree::growTree($this->pos->getWorldNonNull(), $this->pos->x, $this->pos->y, $this->pos->z, new Random(mt_rand()), $this->treeType);
 
 			$item->pop();
 
@@ -81,7 +81,7 @@ class Sapling extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 
@@ -90,12 +90,12 @@ class Sapling extends Flowable{
 	}
 
 	public function onRandomTick() : void{
-		if($this->pos->getWorld()->getFullLightAt($this->pos->x, $this->pos->y, $this->pos->z) >= 8 and mt_rand(1, 7) === 1){
+		if($this->pos->getWorldNonNull()->getFullLightAt($this->pos->x, $this->pos->y, $this->pos->z) >= 8 and mt_rand(1, 7) === 1){
 			if($this->ready){
-				Tree::growTree($this->pos->getWorld(), $this->pos->x, $this->pos->y, $this->pos->z, new Random(mt_rand()), $this->treeType);
+				Tree::growTree($this->pos->getWorldNonNull(), $this->pos->x, $this->pos->y, $this->pos->z, new Random(mt_rand()), $this->treeType);
 			}else{
 				$this->ready = true;
-				$this->pos->getWorld()->setBlock($this->pos, $this);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 			}
 		}
 	}

src/block/Sign.php

@@ -86,7 +86,7 @@ class Sign extends Transparent{
 
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileSign){
 			$this->text = $tile->getText();
 		}
@@ -94,7 +94,7 @@ class Sign extends Transparent{
 
 	public function writeStateToWorld() : void{
 		parent::writeStateToWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		assert($tile instanceof TileSign);
 		$tile->setText($this->text);
 	}
@@ -129,7 +129,7 @@ class Sign extends Transparent{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::opposite($this->facing))->getId() === BlockLegacyIds::AIR){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 
@@ -161,7 +161,7 @@ class Sign extends Transparent{
 		$ev->call();
 		if(!$ev->isCancelled()){
 			$this->text = clone $ev->getNewText();
-			$this->pos->getWorld()->setBlock($this->pos, $this);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 			return true;
 		}
 

src/block/Skull.php

@@ -67,7 +67,7 @@ class Skull extends Flowable{
 
 	public function readStateFromWorld() : void{
 		parent::readStateFromWorld();
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		if($tile instanceof TileSkull){
 			$this->skullType = $tile->getSkullType();
 			$this->rotation = $tile->getRotation();
@@ -77,7 +77,7 @@ class Skull extends Flowable{
 	public function writeStateToWorld() : void{
 		parent::writeStateToWorld();
 		//extra block properties storage hack
-		$tile = $this->pos->getWorld()->getTile($this->pos);
+		$tile = $this->pos->getWorldNonNull()->getTile($this->pos);
 		assert($tile instanceof TileSkull);
 		$tile->setRotation($this->rotation);
 		$tile->setSkullType($this->skullType);

src/block/SnowLayer.php

@@ -91,8 +91,8 @@ class SnowLayer extends Flowable implements Fallable{
 	}
 
 	public function onRandomTick() : void{
-		if($this->pos->getWorld()->getBlockLightAt($this->pos->x, $this->pos->y, $this->pos->z) >= 12){
+		if($this->pos->getWorldNonNull()->getBlockLightAt($this->pos->x, $this->pos->y, $this->pos->z) >= 12){
-			$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::AIR(), false);
+			$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::AIR(), false);
 		}
 	}
 

src/block/Stem.php

@@ -45,7 +45,7 @@ abstract class Stem extends Crops{
 				$ev = new BlockGrowEvent($this, $block);
 				$ev->call();
 				if(!$ev->isCancelled()){
-					$this->pos->getWorld()->setBlock($this->pos, $ev->getNewState());
+					$this->pos->getWorldNonNull()->setBlock($this->pos, $ev->getNewState());
 				}
 			}else{
 				$grow = $this->getPlant();
@@ -61,7 +61,7 @@ abstract class Stem extends Crops{
 					$ev = new BlockGrowEvent($side, $grow);
 					$ev->call();
 					if(!$ev->isCancelled()){
-						$this->pos->getWorld()->setBlock($side->pos, $ev->getNewState());
+						$this->pos->getWorldNonNull()->setBlock($side->pos, $ev->getNewState());
 					}
 				}
 			}

src/block/Sugarcane.php

@@ -57,20 +57,20 @@ class Sugarcane extends Flowable{
 		if($item instanceof Fertilizer){
 			if(!$this->getSide(Facing::DOWN)->isSameType($this)){
 				for($y = 1; $y < 3; ++$y){
-					$b = $this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y + $y, $this->pos->z);
+					$b = $this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y + $y, $this->pos->z);
 					if($b->getId() === BlockLegacyIds::AIR){
 						$ev = new BlockGrowEvent($b, VanillaBlocks::SUGARCANE());
 						$ev->call();
 						if($ev->isCancelled()){
 							break;
 						}
-						$this->pos->getWorld()->setBlock($b->pos, $ev->getNewState());
+						$this->pos->getWorldNonNull()->setBlock($b->pos, $ev->getNewState());
 					}else{
 						break;
 					}
 				}
 				$this->age = 0;
-				$this->pos->getWorld()->setBlock($this->pos, $this);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 			}
 
 			$item->pop();
@@ -84,7 +84,7 @@ class Sugarcane extends Flowable{
 	public function onNearbyBlockChange() : void{
 		$down = $this->getSide(Facing::DOWN);
 		if($down->isTransparent() and !$down->isSameType($this)){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 
@@ -96,17 +96,17 @@ class Sugarcane extends Flowable{
 		if(!$this->getSide(Facing::DOWN)->isSameType($this)){
 			if($this->age === 15){
 				for($y = 1; $y < 3; ++$y){
-					$b = $this->pos->getWorld()->getBlockAt($this->pos->x, $this->pos->y + $y, $this->pos->z);
+					$b = $this->pos->getWorldNonNull()->getBlockAt($this->pos->x, $this->pos->y + $y, $this->pos->z);
 					if($b->getId() === BlockLegacyIds::AIR){
-						$this->pos->getWorld()->setBlock($b->pos, VanillaBlocks::SUGARCANE());
+						$this->pos->getWorldNonNull()->setBlock($b->pos, VanillaBlocks::SUGARCANE());
 						break;
 					}
 				}
 				$this->age = 0;
-				$this->pos->getWorld()->setBlock($this->pos, $this);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 			}else{
 				++$this->age;
-				$this->pos->getWorld()->setBlock($this->pos, $this);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 			}
 		}
 	}

src/block/TNT.php

@@ -90,14 +90,14 @@ class TNT extends Opaque{
 	}
 
 	public function ignite(int $fuse = 80) : void{
-		$this->pos->getWorld()->setBlock($this->pos, VanillaBlocks::AIR());
+		$this->pos->getWorldNonNull()->setBlock($this->pos, VanillaBlocks::AIR());
 
 		$mot = (new Random())->nextSignedFloat() * M_PI * 2;
 		$nbt = EntityFactory::createBaseNBT($this->pos->add(0.5, 0, 0.5), new Vector3(-sin($mot) * 0.02, 0.2, -cos($mot) * 0.02));
 		$nbt->setShort("Fuse", $fuse);
 
 		/** @var PrimedTNT $tnt */
-		$tnt = EntityFactory::create(PrimedTNT::class, $this->pos->getWorld(), $nbt);
+		$tnt = EntityFactory::create(PrimedTNT::class, $this->pos->getWorldNonNull(), $nbt);
 		$tnt->spawnToAll();
 	}
 

src/block/TallGrass.php

@@ -52,7 +52,7 @@ class TallGrass extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if($this->getSide(Facing::DOWN)->isTransparent()){ //Replace with common break method
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/Torch.php

@@ -60,7 +60,7 @@ class Torch extends Flowable{
 		$face = Facing::opposite($this->facing);
 
 		if($this->getSide($face)->isTransparent() and !($face === Facing::DOWN and ($below->getId() === BlockLegacyIds::FENCE or $below->getId() === BlockLegacyIds::COBBLESTONE_WALL))){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 

src/block/Trapdoor.php

@@ -77,8 +77,8 @@ class Trapdoor extends Transparent{
 
 	public function onInteract(Item $item, int $face, Vector3 $clickVector, ?Player $player = null) : bool{
 		$this->open = !$this->open;
-		$this->pos->getWorld()->setBlock($this->pos, $this);
+		$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
-		$this->pos->getWorld()->addSound($this->pos, new DoorSound());
+		$this->pos->getWorldNonNull()->addSound($this->pos, new DoorSound());
 		return true;
 	}
 }

src/block/Vine.php

@@ -115,9 +115,9 @@ class Vine extends Flowable{
 
 		if($changed){
 			if(count($this->faces) === 0){
-				$this->pos->getWorld()->useBreakOn($this->pos);
+				$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 			}else{
-				$this->pos->getWorld()->setBlock($this->pos, $this);
+				$this->pos->getWorldNonNull()->setBlock($this->pos, $this);
 			}
 		}
 	}

src/block/WaterLily.php

@@ -56,7 +56,7 @@ class WaterLily extends Flowable{
 
 	public function onNearbyBlockChange() : void{
 		if(!($this->getSide(Facing::DOWN) instanceof Water)){
-			$this->pos->getWorld()->useBreakOn($this->pos);
+			$this->pos->getWorldNonNull()->useBreakOn($this->pos);
 		}
 	}
 }

src/block/tile/BrewingStand.php

@@ -55,7 +55,7 @@ class BrewingStand extends Spawnable implements Container, Nameable{
 		parent::__construct($world, $pos);
 		$this->inventory = new BrewingStandInventory($this->pos);
 		$this->inventory->addChangeListeners(CallbackInventoryChangeListener::onAnyChange(function(Inventory $unused) : void{
-			$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, 1);
+			$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, 1);
 		}));
 	}
 

src/block/tile/Chest.php

@@ -99,7 +99,7 @@ class Chest extends Spawnable implements Container, Nameable{
 			$this->inventory->removeAllViewers();
 
 			if($this->doubleInventory !== null){
-				if($this->isPaired() and $this->pos->getWorld()->isChunkLoaded($this->pairX >> 4, $this->pairZ >> 4)){
+				if($this->isPaired() and $this->pos->getWorldNonNull()->isChunkLoaded($this->pairX >> 4, $this->pairZ >> 4)){
 					$this->doubleInventory->removeAllViewers();
 					if(($pair = $this->getPair()) !== null){
 						$pair->doubleInventory = null;
@@ -137,7 +137,7 @@ class Chest extends Spawnable implements Container, Nameable{
 	}
 
 	protected function checkPairing() : void{
-		if($this->isPaired() and !$this->pos->getWorld()->isInLoadedTerrain(new Vector3($this->pairX, $this->pos->y, $this->pairZ))){
+		if($this->isPaired() and !$this->pos->getWorldNonNull()->isInLoadedTerrain(new Vector3($this->pairX, $this->pos->y, $this->pairZ))){
 			//paired to a tile in an unloaded chunk
 			$this->doubleInventory = null;
 
@@ -173,7 +173,7 @@ class Chest extends Spawnable implements Container, Nameable{
 
 	public function getPair() : ?Chest{
 		if($this->isPaired()){
-			$tile = $this->pos->getWorld()->getTileAt($this->pairX, $this->pos->y, $this->pairZ);
+			$tile = $this->pos->getWorldNonNull()->getTileAt($this->pairX, $this->pos->y, $this->pairZ);
 			if($tile instanceof Chest){
 				return $tile;
 			}

src/block/tile/Furnace.php

@@ -60,7 +60,7 @@ class Furnace extends Spawnable implements Container, Nameable{
 		$this->inventory = new FurnaceInventory($this->pos);
 		$this->inventory->addChangeListeners(CallbackInventoryChangeListener::onAnyChange(
 			function(Inventory $unused) : void{
-				$this->pos->getWorld()->scheduleDelayedBlockUpdate($this->pos, 1);
+				$this->pos->getWorldNonNull()->scheduleDelayedBlockUpdate($this->pos, 1);
 			})
 		);
 	}
@@ -129,7 +129,7 @@ class Furnace extends Spawnable implements Container, Nameable{
 		$block = $this->getBlock();
 		if($block instanceof BlockFurnace and !$block->isLit()){
 			$block->setLit(true);
-			$this->pos->getWorld()->setBlock($block->getPos(), $block);
+			$this->pos->getWorldNonNull()->setBlock($block->getPos(), $block);
 		}
 
 		if($this->remainingFuelTime > 0 and $ev->isBurning()){
@@ -155,7 +155,7 @@ class Furnace extends Spawnable implements Container, Nameable{
 		$fuel = $this->inventory->getFuel();
 		$raw = $this->inventory->getSmelting();
 		$product = $this->inventory->getResult();
-		$smelt = $this->pos->getWorld()->getServer()->getCraftingManager()->matchFurnaceRecipe($raw);
+		$smelt = $this->pos->getWorldNonNull()->getServer()->getCraftingManager()->matchFurnaceRecipe($raw);
 		$canSmelt = ($smelt instanceof FurnaceRecipe and $raw->getCount() > 0 and (($smelt->getResult()->equals($product) and $product->getCount() < $product->getMaxStackSize()) or $product->isNull()));
 
 		if($this->remainingFuelTime <= 0 and $canSmelt and $fuel->getFuelTime() > 0 and $fuel->getCount() > 0){
@@ -192,7 +192,7 @@ class Furnace extends Spawnable implements Container, Nameable{
 			$block = $this->getBlock();
 			if($block instanceof BlockFurnace and $block->isLit()){
 				$block->setLit(false);
-				$this->pos->getWorld()->setBlock($block->getPos(), $block);
+				$this->pos->getWorldNonNull()->setBlock($block->getPos(), $block);
 			}
 			$this->remainingFuelTime = $this->cookTime = $this->maxFuelTime = 0;
 		}

src/block/tile/Tile.php

@@ -95,7 +95,7 @@ abstract class Tile{
 	}
 
 	public function getBlock() : Block{
-		return $this->pos->getWorld()->getBlock($this->pos);
+		return $this->pos->getWorldNonNull()->getBlock($this->pos);
 	}
 
 	public function getPos() : Position{
@@ -130,7 +130,7 @@ abstract class Tile{
 			$this->closed = true;
 
 			if($this->pos->isValid()){
-				$this->pos->getWorld()->removeTile($this);
+				$this->pos->getWorldNonNull()->removeTile($this);
 				$this->pos->setWorld(null);
 			}
 		}

src/block/utils/FallableTrait.php

@@ -56,7 +56,7 @@ trait FallableTrait{
 			$nbt->setByte("Data", $this->getMeta());
 
 			/** @var FallingBlock $fall */
-			$fall = EntityFactory::create(FallingBlock::class, $pos->getWorld(), $nbt);
+			$fall = EntityFactory::create(FallingBlock::class, $pos->getWorldNonNull(), $nbt);
 			$fall->spawnToAll();
 		}
 	}

src/command/defaults/SeedCommand.php

@@ -44,7 +44,7 @@ class SeedCommand extends VanillaCommand{
 		}
 
 		if($sender instanceof Player){
-			$seed = $sender->getPosition()->getWorld()->getSeed();
+			$seed = $sender->getPosition()->getWorldNonNull()->getSeed();
 		}else{
 			$seed = $sender->getServer()->getWorldManager()->getDefaultWorld()->getSeed();
 		}

src/entity/Entity.php

@@ -1342,7 +1342,7 @@ abstract class Entity{
 		}
 
 		if($pos instanceof Position and $pos->world !== null and $pos->world !== $this->getWorld()){
-			if(!$this->switchWorld($pos->getWorld())){
+			if(!$this->switchWorld($pos->getWorldNonNull())){
 				return false;
 			}
 		}
@@ -1456,7 +1456,7 @@ abstract class Entity{
 			$pitch = $pitch ?? $pos->pitch;
 		}
 		$from = $this->location->asPosition();
-		$to = Position::fromObject($pos, $pos instanceof Position ? $pos->getWorld() : $this->getWorld());
+		$to = Position::fromObject($pos, $pos instanceof Position ? $pos->getWorldNonNull() : $this->getWorld());
 		$ev = new EntityTeleportEvent($this, $from, $to);
 		$ev->call();
 		if($ev->isCancelled()){

src/entity/Living.php

@@ -206,7 +206,7 @@ abstract class Living extends Entity{
 	public function hasLineOfSight(Entity $entity) : bool{
 		//TODO: head height
 		return true;
-		//return $this->getLevel()->rayTraceBlocks(Vector3::createVector($this->x, $this->y + $this->height, $this->z), Vector3::createVector($entity->x, $entity->y + $entity->height, $entity->z)) === null;
+		//return $this->getLevelNonNull()->rayTraceBlocks(Vector3::createVector($this->x, $this->y + $this->height, $this->z), Vector3::createVector($entity->x, $entity->y + $entity->height, $entity->z)) === null;
 	}
 
 	public function getEffects() : EffectManager{

src/entity/Location.php

@@ -68,7 +68,7 @@ class Location extends Position{
 	}
 
 	public function __toString(){
-		return "Location (world=" . ($this->isValid() ? $this->getWorld()->getDisplayName() : "null") . ", x=$this->x, y=$this->y, z=$this->z, yaw=$this->yaw, pitch=$this->pitch)";
+		return "Location (world=" . ($this->isValid() ? $this->getWorldNonNull()->getDisplayName() : "null") . ", x=$this->x, y=$this->y, z=$this->z, yaw=$this->yaw, pitch=$this->pitch)";
 	}
 
 	public function equals(Vector3 $v) : bool{

src/inventory/ChestInventory.php

@@ -51,7 +51,7 @@ class ChestInventory extends BlockInventory{
 		if(count($this->getViewers()) === 1 and $this->getHolder()->isValid()){
 			//TODO: this crap really shouldn't be managed by the inventory
 			$this->broadcastBlockEventPacket(true);
-			$this->getHolder()->getWorld()->addSound($this->getHolder()->add(0.5, 0.5, 0.5), $this->getOpenSound());
+			$this->getHolder()->getWorldNonNull()->addSound($this->getHolder()->add(0.5, 0.5, 0.5), $this->getOpenSound());
 		}
 	}
 
@@ -59,7 +59,7 @@ class ChestInventory extends BlockInventory{
 		if(count($this->getViewers()) === 1 and $this->getHolder()->isValid()){
 			//TODO: this crap really shouldn't be managed by the inventory
 			$this->broadcastBlockEventPacket(false);
-			$this->getHolder()->getWorld()->addSound($this->getHolder()->add(0.5, 0.5, 0.5), $this->getCloseSound());
+			$this->getHolder()->getWorldNonNull()->addSound($this->getHolder()->add(0.5, 0.5, 0.5), $this->getCloseSound());
 		}
 		parent::onClose($who);
 	}
@@ -68,6 +68,6 @@ class ChestInventory extends BlockInventory{
 		$holder = $this->getHolder();
 
 		//event ID is always 1 for a chest
-		$holder->getWorld()->broadcastPacketToViewers($holder, BlockEventPacket::create(1, $isOpen ? 1 : 0, $holder->asVector3()));
+		$holder->getWorldNonNull()->broadcastPacketToViewers($holder, BlockEventPacket::create(1, $isOpen ? 1 : 0, $holder->asVector3()));
 	}
 }

src/item/Bow.php

@@ -105,7 +105,7 @@ class Bow extends Tool{
 			}
 
 			$ev->getProjectile()->spawnToAll();
-			$location->getWorld()->addSound($location, new BowShootSound());
+			$location->getWorldNonNull()->addSound($location, new BowShootSound());
 		}else{
 			$entity->spawnToAll();
 		}

src/item/PaintingItem.php

@@ -94,7 +94,7 @@ class PaintingItem extends Item{
 		$nbt->setInt("TileZ", $clickedPos->getFloorZ());
 
 		/** @var Painting $entity */
-		$entity = EntityFactory::create(Painting::class, $replacePos->getWorld(), $nbt);
+		$entity = EntityFactory::create(Painting::class, $replacePos->getWorldNonNull(), $nbt);
 		$this->pop();
 		$entity->spawnToAll();
 

src/item/ProjectileItem.php

@@ -72,7 +72,7 @@ abstract class ProjectileItem extends Item{
 
 		$projectile->spawnToAll();
 
-		$location->getWorld()->addSound($location, new ThrowSound());
+		$location->getWorldNonNull()->addSound($location, new ThrowSound());
 
 		$this->pop();
 

src/network/mcpe/handler/InGamePacketHandler.php

@@ -346,7 +346,7 @@ class InGamePacketHandler extends PacketHandler{
 			}else{
 				$blocks[] = $blockPos;
 			}
-			$this->player->getLocation()->getWorld()->sendBlocks([$this->player], $blocks);
+			$this->player->getLocation()->getWorldNonNull()->sendBlocks([$this->player], $blocks);
 		}
 	}
 
@@ -539,7 +539,7 @@ class InGamePacketHandler extends PacketHandler{
 			return false;
 		}
 
-		$block = $this->player->getLocation()->getWorld()->getBlock($pos);
+		$block = $this->player->getLocation()->getWorldNonNull()->getBlock($pos);
 		try{
 			$offset = 0;
 			$nbt = (new NetworkNbtSerializer())->read($packet->namedtag, $offset, 512)->mustGetCompoundTag();

src/network/mcpe/handler/PreSpawnPacketHandler.php

@@ -65,12 +65,12 @@ class PreSpawnPacketHandler extends PacketHandler{
 		$pk->seed = -1;
 		$pk->dimension = DimensionIds::OVERWORLD; //TODO: implement this properly
 		$pk->worldGamemode = NetworkSession::getClientFriendlyGamemode($this->server->getGamemode());
-		$pk->difficulty = $location->getWorld()->getDifficulty();
+		$pk->difficulty = $location->getWorldNonNull()->getDifficulty();
 		$pk->spawnX = $spawnPosition->getFloorX();
 		$pk->spawnY = $spawnPosition->getFloorY();
 		$pk->spawnZ = $spawnPosition->getFloorZ();
 		$pk->hasAchievementsDisabled = true;
-		$pk->time = $location->getWorld()->getTime();
+		$pk->time = $location->getWorldNonNull()->getTime();
 		$pk->eduEditionOffer = 0;
 		$pk->rainLevel = 0; //TODO: implement these properly
 		$pk->lightningLevel = 0;

src/player/Player.php

@@ -949,7 +949,7 @@ class Player extends Human implements CommandSender, ChunkLoader, ChunkListener,
 		if(!($pos instanceof Position)){
 			$world = $this->getWorld();
 		}else{
-			$world = $pos->getWorld();
+			$world = $pos->getWorldNonNull();
 		}
 		$this->spawnPosition = new Position($pos->x, $pos->y, $pos->z, $world);
 		$this->networkSession->syncPlayerSpawnPoint($this->spawnPosition);
@@ -2044,7 +2044,7 @@ class Player extends Human implements CommandSender, ChunkLoader, ChunkListener,
 		}
 
 		if($this->hasValidSpawnPosition()){
-			$nbt->setString("SpawnLevel", $this->spawnPosition->getWorld()->getFolderName());
+			$nbt->setString("SpawnLevel", $this->spawnPosition->getWorldNonNull()->getFolderName());
 			$nbt->setInt("SpawnX", $this->spawnPosition->getFloorX());
 			$nbt->setInt("SpawnY", $this->spawnPosition->getFloorY());
 			$nbt->setInt("SpawnZ", $this->spawnPosition->getFloorZ());
@@ -2117,7 +2117,7 @@ class Player extends Human implements CommandSender, ChunkLoader, ChunkListener,
 		$ev = new PlayerRespawnEvent($this, $this->getSpawn());
 		$ev->call();
 
-		$realSpawn = Position::fromObject($ev->getRespawnPosition()->add(0.5, 0, 0.5), $ev->getRespawnPosition()->getWorld());
+		$realSpawn = Position::fromObject($ev->getRespawnPosition()->add(0.5, 0, 0.5), $ev->getRespawnPosition()->getWorldNonNull());
 		$this->teleport($realSpawn);
 
 		$this->setSprinting(false);

src/utils/AssumptionFailedError.php

@@ -0,0 +1,33 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\utils;
+
+/**
+ * This exception should be thrown in places where something is assumed to be true, but the type system does not provide
+ * a guarantee. This makes static analysers happy and makes sure that the server will crash properly if any assumption
+ * does not hold.
+ */
+final class AssumptionFailedError extends \Error{
+
+}

src/world/Explosion.php

@@ -72,7 +72,7 @@ class Explosion{
 			throw new \InvalidArgumentException("Position does not have a valid world");
 		}
 		$this->source = $center;
-		$this->world = $center->getWorld();
+		$this->world = $center->getWorldNonNull();
 
 		if($size <= 0){
 			throw new \InvalidArgumentException("Explosion radius must be greater than 0, got $size");

src/world/Position.php

@@ -24,6 +24,7 @@ declare(strict_types=1);
 namespace pocketmine\world;
 
 use pocketmine\math\Vector3;
+use pocketmine\utils\AssumptionFailedError;
 use function assert;
 
 class Position extends Vector3{
@@ -70,6 +71,20 @@ class Position extends Vector3{
 		return $this->world;
 	}
 
+	/**
+	 * Returns the position's world if valid. Throws an error if the world is unexpectedly null.
+	 *
+	 * @throws AssumptionFailedError
+	 */
+	public function getWorldNonNull() : World{
+		$world = $this->getWorld();
+		if($world === null){
+			throw new AssumptionFailedError("Position world is null");
+		}
+
+		return $world;
+	}
+
 	/**
 	 * Sets the target world of the position.
 	 *
@@ -111,7 +126,7 @@ class Position extends Vector3{
 	}
 
 	public function __toString(){
-		return "Position(world=" . ($this->isValid() ? $this->getWorld()->getDisplayName() : "null") . ",x=" . $this->x . ",y=" . $this->y . ",z=" . $this->z . ")";
+		return "Position(level=" . ($this->isValid() ? $this->getWorldNonNull()->getDisplayName() : "null") . ",x=" . $this->x . ",y=" . $this->y . ",z=" . $this->z . ")";
 	}
 
 	public function equals(Vector3 $v) : bool{