the intent of these hacks was to break cyclic references to avoid having objects lingering in memory. However, all of the stuff that's being removed in this commit no longer has any effect anyway, due to the fact that these things don't circularly reference each other anymore. Notably, Tile inventories now keep Position instead of a Tile ref.
this makes more sense overall from a reader's perspective.
and also provide a rug-jerk for any idiots using World->close() when they aren't supposed to? ....
since we write these into a transaction instead of actually modifying the world directly, we can use the transaction to verify that the placement location is OK before setting the blocks.
closes#4248
instead, use a const array of the offsets and add them to the coordinates, which avoids the allocations.
In synthetic benchmarks, this method takes 40-50% less CPU time by eliding ZEND_INIT_ARRAY and ZEND_ADD_ARRAY opcodes. In practice, the benefit will likely be much smaller (perhaps even irrelevant).
this can fail if the backups directory points to a different drive than the original worlds location. In this case, we have to copy and delete the files instead, which is much slower, but works.
I REALLY advise against putting backups on a different mount point than worlds if you plan to convert large worlds.
when a chunk population is ordered, its only chunk loader is the one that the World installed to keep the chunk loaded while it was generated. So, when the resolver removes its chunk loader from the chunk, it triggers the chunk unloading mechanism, which causes the promise to directly be rejected.
closes#3461
literally every other particle/sound has the subject first, followed by the (optional) verb, and finally Particle (or Sound).
In addition, we refer to breaking blocks as 'break' everywhere except here, where we refer to it as 'destroy'.
this is slightly slower, but saves a significant amount of memory (~80 KB per chunk).
Since ext-chunkutils2 doesn't do copy-on-write trickery like the PHP impl did, we need this to get the memory advantages back.
