For regular players:

• Possibly fixed some worlds and dimensions erroring out.
  • Not sure if this was an issue in the previous version or if this bug was introduced after that, but either way, it's fixed now.
• Fixed several issues with Voxy.

For data pack makers:

• Added a new trait system for chunk generators to share information with other scripts.
  • Data packs with custom world types may need to implement the same traits that built-in world types provide.
• Added script_chance decision tree type.
• Scripts can now create constant literal List's, Set's, and Map's.
  • The collection will only ever be created once, not once every time the script runs.
  • Iteration order is the same as the creation argument order.
• Scripting: integer numeric literals with no suffix no longer default to being less precise than int. Use the new 'y' or 'Y' suffix for byte literals, and 's' or 'S' for shorts.
  • For backwards compatibility, the 'i' and 'I' suffixes will still work too.