How to deal with `Command.description()` with `want_event` is `True`?

[jfcherng]

With want_event=True, we have something like

    def description(self, event: EventDict) -> str: ...

which violates the current stubs

    def description(self) -> str: ...

But if we use @overload like the following in our stubs

    @overload
    def description(self) -> str: ...
    @overload
    def description(self, event: EventDict) -> str: ...

then it will force users to use the following signature in their implementation

    def description(self, event: Optional[EventDict]=None) -> str:

which is annoying and breaks BC.

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How do we fix this without using # type: ignore?

[jrappen]

Links:

• https://docs.python.org/3.8/library/typing.html#typing.overload
• https://peps.python.org/pep-0484/#function-method-overloading