KOS_OP_FAST_ITEM_FAST_REF

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

• Stack: [...] → [..., value]. Push an ItemRef over obj[key] with the object read from a fast slot and the key read from a fast slot.

• Compiler form: The lowering of VAR_ITEM_VAR_REF: every named operand has a fast slot.

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