Class Opcode

tests/python/test_dataclass_py_class.py:203–205

            high = entry(value=20)

        class Opcode(StrEnum, type_key=_unique_key("Opcode")):
            add = entry(value="+")
            mul = entry(value="*")

        @py_class(_unique_key("EnumFields"))
        class Instruction(Object):