this caused some performance issues and silent bugs with the generator, notably that the generator would always think all chunks had been changed, causing them to be re-set back into the world 9 times.
previously a file with a 4-letter name ending in 'mca' in the region folder of a PMAnvil world would cause the world format to be unrecognized. This happens because strrpos() returns false when the substring isn't found, which gets coerced to 0 when used in addition.
PHPStan has no idea what is going on in this code because unpack() returns mixed[].
Possibly it might be a good idea to implement a dynamic return type extension for this.
non-class constants aren't stored during preloading phase and for some reason they aren't pre-resolved in opcode arrays. However, they are resolved by value when referenced by class constants, and class constants stick, so we can use those instead.
this bug became painfully obvious when testing bamboo. Detonating TNT near tall bamboo canes would result in bamboo canes not deleting themselves in some circumstances, because the non-destroyed parts of the cane would be updated before their supporting block was deleted, and subsequently would not be re-updated afterwards.
I think this bug should also reproduce with cacti, but I have not tested.
this is the biggest sector start that the location table can represent, due to the binary format. Larger values than this will overflow and cause corruption.
This provides an effective limit of 64 GB on region files.
we already have a region growth problem due to the lack of garbage collection, but this bug was making it worse. If the region already contained 1024 allocated chunks, 4MB of file space would get wasted before the next chunk would be appended to the file.
this allows assuming that a position has a valid world in places where it's never expected to not be valid. Since this is the vast majority of usages, it eliminates a lot of possible null-pointer warnings given by static analysers.
TODO: Consider whether we can make Position->getLevel/World use this behaviour out of the box in the next major version.
