KOS_OP_ITEM_VAR_STORE_VAR

• Style: EXTRA (VAR, VAR, NOARG, NOARG).

• Stack: [..., obj] → [...]. Set obj[key] = value with the object on the stack, the key resolved by name and the value 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, VAR value, ITEM_STORE, or from VAR value ahead of the shaped ITEM_VAR_STORE. May lower to ITEM_FAST_STORE_FAST.

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