KOS_OP_CALL_VAR_ATTR_NAMES

• Style: EXTRA. Schema: VAR (name/cpool for obj), CONST (attr name), CONST (kwarg names tuple), COUNT (npos).

• Stack: Same as CALL_FAST_ATTR_NAMES. obj is read from the frame namespace by name instead of a fast slot.

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