diff --git a/src/block/BrewingStand.php b/src/block/BrewingStand.php
index c59ea352b..039693164 100644
--- a/src/block/BrewingStand.php
+++ b/src/block/BrewingStand.php
@@ -45,7 +45,7 @@ class BrewingStand extends Transparent{
 	protected array $slots = [];
 
 	protected function describeBlockOnlyState(RuntimeDataDescriber $w) : void{
-		$w->brewingStandSlots($this->slots);
+		$w->enumSet($this->slots, BrewingStandSlot::cases());
 	}
 
 	protected function recalculateCollisionBoxes() : array{
diff --git a/src/block/ChiseledBookshelf.php b/src/block/ChiseledBookshelf.php
index d62f262da..ab1b4ddb3 100644
--- a/src/block/ChiseledBookshelf.php
+++ b/src/block/ChiseledBookshelf.php
@@ -50,7 +50,7 @@ class ChiseledBookshelf extends Opaque{
 
 	protected function describeBlockOnlyState(RuntimeDataDescriber $w) : void{
 		$w->horizontalFacing($this->facing);
-		$w->chiseledBookshelfSlots($this->slots);
+		$w->enumSet($this->slots, ChiseledBookshelfSlot::cases());
 	}
 
 	/**
diff --git a/src/data/runtime/RuntimeDataDescriber.php b/src/data/runtime/RuntimeDataDescriber.php
index f2828c217..af2e79784 100644
--- a/src/data/runtime/RuntimeDataDescriber.php
+++ b/src/data/runtime/RuntimeDataDescriber.php
@@ -72,6 +72,8 @@ interface RuntimeDataDescriber extends RuntimeEnumDescriber{
 	/**
 	 * @param BrewingStandSlot[] $slots
 	 * @phpstan-param array<int, BrewingStandSlot> $slots
+	 *
+	 * @deprecated Use {@link enumSet()} instead.
 	 */
 	public function brewingStandSlots(array &$slots) : void;
 
@@ -79,15 +81,19 @@ interface RuntimeDataDescriber extends RuntimeEnumDescriber{
 
 	public function straightOnlyRailShape(int &$railShape) : void;
 
-	/**
-	 * @param ChiseledBookshelfSlot[] $slots
-	 * @phpstan-param array<int, ChiseledBookshelfSlot> $slots
-	 */
-	public function chiseledBookshelfSlots(array &$slots) : void;
-
 	/**
 	 * @phpstan-template T of \UnitEnum
 	 * @phpstan-param T $case
 	 */
 	public function enum(\UnitEnum &$case) : void;
+
+	/**
+	 * @param \UnitEnum[] &$set
+	 * @param \UnitEnum[] $allCases
+	 *
+	 * @phpstan-template T of \UnitEnum
+	 * @phpstan-param array<int, T> &$set
+	 * @phpstan-param array<int, T> $allCases
+	 */
+	public function enumSet(array &$set, array $allCases) : void;
 }
diff --git a/src/data/runtime/RuntimeDataReader.php b/src/data/runtime/RuntimeDataReader.php
index a3bd0863c..039493fe3 100644
--- a/src/data/runtime/RuntimeDataReader.php
+++ b/src/data/runtime/RuntimeDataReader.php
@@ -182,16 +182,11 @@ final class RuntimeDataReader implements RuntimeDataDescriber{
 	/**
 	 * @param BrewingStandSlot[] $slots
 	 * @phpstan-param array<int, BrewingStandSlot> $slots
+	 *
+	 * @deprecated Use {@link enumSet()} instead.
 	 */
 	public function brewingStandSlots(array &$slots) : void{
-		$result = [];
-		foreach(BrewingStandSlot::cases() as $member){
-			if($this->readBool()){
-				$result[spl_object_id($member)] = $member;
-			}
-		}
-
-		$slots = $result;
+		$this->enumSet($slots, BrewingStandSlot::cases());
 	}
 
 	public function railShape(int &$railShape) : void{
@@ -212,20 +207,6 @@ final class RuntimeDataReader implements RuntimeDataDescriber{
 		$railShape = $result;
 	}
 
-	/**
-	 * @param ChiseledBookshelfSlot[] $slots
-	 * @phpstan-param array<int, ChiseledBookshelfSlot> $slots
-	 */
-	public function chiseledBookshelfSlots(array &$slots) : void{
-		$result = [];
-		foreach(ChiseledBookshelfSlot::cases() as $member){
-			if($this->readBool()){
-				$result[spl_object_id($member)] = $member;
-			}
-		}
-		$slots = $result;
-	}
-
 	public function enum(\UnitEnum &$case) : void{
 		$metadata = RuntimeEnumMetadata::from($case);
 		$raw = $this->readInt($metadata->bits);
@@ -237,5 +218,15 @@ final class RuntimeDataReader implements RuntimeDataDescriber{
 		$case = $result;
 	}
 
+	public function enumSet(array &$set, array $allCases) : void{
+		$result = [];
+		foreach($allCases as $case){
+			if($this->readBool()){
+				$result[spl_object_id($case)] = $case;
+			}
+		}
+		$set = $result;
+	}
+
 	public function getOffset() : int{ return $this->offset; }
 }
diff --git a/src/data/runtime/RuntimeDataSizeCalculator.php b/src/data/runtime/RuntimeDataSizeCalculator.php
index da9d1a956..ecf075a45 100644
--- a/src/data/runtime/RuntimeDataSizeCalculator.php
+++ b/src/data/runtime/RuntimeDataSizeCalculator.php
@@ -97,12 +97,12 @@ final class RuntimeDataSizeCalculator implements RuntimeDataDescriber{
 		$this->addBits(3);
 	}
 
-	public function chiseledBookshelfSlots(array &$slots) : void{
-		$this->addBits(count(ChiseledBookshelfSlot::cases()));
-	}
-
 	public function enum(\UnitEnum &$case) : void{
 		$metadata = RuntimeEnumMetadata::from($case);
 		$this->addBits($metadata->bits);
 	}
+
+	public function enumSet(array &$set, array $allCases) : void{
+		$this->addBits(count($allCases));
+	}
 }
diff --git a/src/data/runtime/RuntimeDataWriter.php b/src/data/runtime/RuntimeDataWriter.php
index 184c52a0a..b6995806f 100644
--- a/src/data/runtime/RuntimeDataWriter.php
+++ b/src/data/runtime/RuntimeDataWriter.php
@@ -160,11 +160,11 @@ final class RuntimeDataWriter implements RuntimeDataDescriber{
 	/**
 	 * @param BrewingStandSlot[] $slots
 	 * @phpstan-param array<int, BrewingStandSlot> $slots
+	 *
+	 * @deprecated Use {@link enumSet()} instead.
 	 */
 	public function brewingStandSlots(array &$slots) : void{
-		foreach(BrewingStandSlot::cases() as $member){
-			$this->writeBool(isset($slots[spl_object_id($member)]));
-		}
+		$this->enumSet($slots, BrewingStandSlot::cases());
 	}
 
 	public function railShape(int &$railShape) : void{
@@ -175,21 +175,17 @@ final class RuntimeDataWriter implements RuntimeDataDescriber{
 		$this->int(3, $railShape);
 	}
 
-	/**
-	 * @param ChiseledBookshelfSlot[] $slots
-	 * @phpstan-param array<int, ChiseledBookshelfSlot> $slots
-	 */
-	public function chiseledBookshelfSlots(array &$slots) : void{
-		foreach(ChiseledBookshelfSlot::cases() as $member){
-			$this->writeBool(isset($slots[spl_object_id($member)]));
-		}
-	}
-
 	public function enum(\UnitEnum &$case) : void{
 		$metadata = RuntimeEnumMetadata::from($case);
 		$this->writeInt($metadata->bits, $metadata->enumToInt($case));
 	}
 
+	public function enumSet(array &$set, array $allCases) : void{
+		foreach($allCases as $case){
+			$this->writeBool(isset($set[spl_object_id($case)]));
+		}
+	}
+
 	public function getValue() : int{ return $this->value; }
 
 	public function getOffset() : int{ return $this->offset; }