format_map over specified

[jaraco]

The definition of format_map indicates that the input is a Mapping[str, Any] when a Mapping is over-specified. format_map only requires the __getitem__ interface of a Mapping (not __iter__ nor __len__). Requiring Mapping forces someone writing an adapter to supply a full Mapping implementation for no purpose.

[JelleZijlstra]

Feel free to submit a PR changing the argument type to a Protocol that just has __getitem__.

[djb4ai]

@jaraco Are you working on this?

[jaraco]

I am not. I would be delighted if someone else would work on it.