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f8bfbc107d
This takes advantage of two key behaviours of PHP: 1. Assigning a string does not copy the string 2. Changing an offset in a string causes the string to be copied. These two factors combined, along with the fact that blocklight and skylight arrays are usually all-zeros, allow us to produce a significant memory usage reduction of loaded chunks. A freshly generated PM world with 3,332 chunks loaded drops from 310MB to 200MB memory usage with these changes applied.