zml2008/Glowstone — comment on commit 39487c400e49bdf65d551cd4e3e1c8e296260486
File:  line 0
By zml2008:

yeah. Instead of converting the nibbles that are used in chunk storage and map chunk packets to bytes when loading chunks and back when saving and preparing them for transport, everything is stored in nibble arrays and only packed or unpacked when making changes or geting a specific block's data. Trying to improve performance.