False positive error?

[oriontvv]

I see error for code:

def func(choice: str, default: str='y') -> bool:
    values = ('yes', '') if default == 'y' else ('yes',) # error: Unsupported right operand type for in ("object")
    # values = ('yes', '') if True else ('yes',) # ok (!)
    return choice in values

Is it a bug? mypy version is 0.641

[ilevkivskyi]

This is a known bug, duplicate of #4975.

Workaround is to use lists instead of tuples (or use # type: ignore on that line to silence mypy).