[bobbiechen]

Isn't this supported by typing.SupportsIndex? https://docs.python.org/3/library/typing.html#typing.Support...

Mind you, I haven't used it before, but it feels very similar to the abstract Mapping types.

[detaro]

__index__ is not what you think it is

[bobbiechen]

Oops, thanks for the correction. That's on me for drive-by commenting.