entityKind.spawn

The one writable field. true: the kind is in this world as the game defines it: it spawns by the game's own rule, also on a mode: lite world, and attacks and interact are on for it unless a pack sets them; an error on a 1.8.9 world with no biomes, where nothing would spawn it. false: the kind never spawns by itself in this world; spawner blocks, world.spawn, /summon and breeding still make it. nil: the pack says nothing and the world's default applies: no natural spawning on a mode: lite world and in a room from rooms.create, the game's own rule on a mode: full world and after world.rules{ survival = true }. A table is an error today. Reads what this pack set (true, false or nil), not the game's own rule. The value is this room's (room.game.entities.cow.spawn) and this pack's: a false of any pack wins. Every write is an error on a game with no natural spawning (a0.1.0 to a0.1.3).

entityKind.spawn: boolean?