What kind of feature are you missing? Where do you notice a shortcoming of PTB?

Since mypy 0.990, implicit optional types are disabled by default. Maybe it is a good time to switch to explicit optional types, if so I can work on this.

Future reference: https://github.com/hauntsaninja/no_implicit_optional

Describe the solution you'd like

Switch to explicit optional types (e.g. def foo(s: str | None = None))

Describe alternatives you've considered

No response

Additional context

No response