Dylan K. Taylor 28a72a93b4 Chunk: Use an SplFixedArray for heightmap
this goes on 3.1 because it changes the behaviour of chunk cloning, which might possibly break some plugins, and this isn't a bug fix.

This should see no change in behaviour other than a minor performance improvement and slight reduction in memory usage.
2018-07-05 11:58:20 +01:00
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