Classic Gamerule

A simple mod that brings back the classic gamerule names to MC 1.21.11+

Minecraft renamed all gamerules from camelCase to namespaced:snake_case in 25w44a (1.21.11 snapshot),
and even reverted the values of some rules, which broke all existing usage of gamerules.
This is a poorly implemented incompatible change. Let’s “revert” it by restoring the old names in Minecraft.

For example, classic gamerules like doDaylightCycle were changed to advance_time (actually minecraft:advance_time), and doMobSpawning became spawn_mobs

What This Mod Does

Functionalities:

1. Add all camelCase names as aliases for existing gamerules, e.g. /gamerule doMobSpawning false will work again now
2. Correctly mapped rule values that were inverted, e.g., disableElytraMovementCheck has the opposite value of minecraft:elytra_movement_check

Limitation:

1. This mod only restores the classic naming conventions and value mappings. It does not revert the newly added value constraints for certain gamerules (e.g. minecraft:max_entity_cramming)
2. Classic rule doFireTick and allowFireTicksAwayFromPlayer are read-only now. Since their successor minecraft:fire_spread_radius_around_player cannot perfectly express the intention of these 2 old rules

Requirement

This mod is server-side only (including single-player worlds) and requires no additional dependencies.
It supports all Minecraft versions since 1.21.11