KOS_OP_ITEM_STORE_FAST

• Style: FASTVAR (the value’s slot).

• Stack: [..., obj, key] → [...]. Set obj[key] = value with the object on the stack, the key on the stack and the value read from a fast slot.

• 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: The lowering of ITEM_STORE_VAR: every named operand has a fast slot.

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