KOS_OP_SWITCH_EQ_FAST

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

• Stack: [..., s]. Resolve rhs = KosNamespace_FastDeref(ns, a1), then compare s == rhs with Py_EQ.

  • Match: pop s; pc = a0.

  • Mismatch: fall through; stack unchanged.

• Compiler form: tuple arg ("label", slot_index, 0, 0) pre-compile.

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