KOS_OP_ITEM_VAR_INPLACE_CONST

• Style: EXTRA (OPERAND, VAR, 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 resolved by name.

• Cache: none; a VAR row survives lowering only for a name with no fast slot.

• Compiler form: Folded by the compress pipeline from VAR key, CONST rhs, ITEM_INPLACE at a count of one, or from CONST rhs ahead of the shaped ITEM_VAR_INPLACE. May lower to ITEM_FAST_INPLACE_CONST.

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