KOS_OP_ITEM_CONST_INPLACE_CONST

• Style: EXTRA (OPERAND, CONST, CONST, NOARG).

• Stack: [..., obj] → [...]. Reduce obj[key] in place with the pool constant and store it back with the object on the stack and the key a pool constant.

• Cache: one KOS_CACHE_ITEM slot; the site elects a body for the container kind it first sees through the shared helper in eval/eval_item.c (see the items section of the VM reference).

• Compiler form: Folded by the compress pipeline from CONST key, CONST rhs, ITEM_INPLACE at a count of one, or from CONST rhs ahead of the shaped ITEM_CONST_INPLACE.

• Implementation: koskari/lib/opcode/ITEM_CONST_INPLACE_CONST.c