Shared via mypy Playground

main.py

from collections.abc import Sequence
from enum import Enum
from typing import Self, overload

class MyStr(Sequence["MyStr"]):
    @overload
    def __new__(cls, object: object = ...) -> Self: ...
    @overload
    def __new__(cls, object: bytes, encoding: str = ..., errors: str = ...) -> Self: ...


class MyStrEnum(MyStr, Enum):
    A = "a"  # ok
    B = b"b", "utf-8"  # ok, see the typeshed definition of `str.__new__`
    C = "too", "many", "arguments", "provided"  # runtime error: TypeError: str() takes at most 3 arguments (4 given)