KOS_OP_CALL_FAST_ATTR_NAMES

• Style: EXTRA. Schema: FASTVAR (slot index for obj), CONST (attr name), CONST (kwarg names tuple), COUNT (npos).

• Stack: [..., pos_0, ..., pos_{N-1}, kwd_val_0, ..., kwd_val_{M-1}] → [..., result]. obj is read from fast slot a0 and is not on the stack, one fewer element than CALL_ATTR_NAMES. Resolution and the call proceed as CALL_ATTR_NAMES describes: an unbound function found on the class receives obj first, any other callable the arguments alone.

• Compiler form: Not emitted by the compiler; available for manual bytecode construction.