NO_DECAY_AND_CHECK_DECAY metas don't make much sense, I don't think those are needed.
In fact, I'd rather have the basic metas for the leaves type (apple, conifer, birch, jungle), their synonyms (oak, spruce, ...) and then the flags as a separate thing (`E_META_LEAVES_CHECK_DECAY`, `E_META_LEAVES_NO_DECAY`)