KOS_OP_FAST_ITEM

• Style: FASTVAR (the object’s slot).

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

• 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 VAR_ITEM: every named operand has a fast slot.

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