use 'UndefinedLike = Any' as the type hint

[brahn]

Improvement on #2670 -- see summary and discussion there

[mattijn]

As is mentioned in this comment: #2614, which counts here as well:

Thanks! Note the line at the top of the file: https://github.com/altair-viz/altair/blob/c4248a953c8518efb3cf5bef8d9755bd0fc7391e/altair/utils/schemapi.py#L1-L2

You should make these changes in https://github.com/altair-viz/altair/blob/master/tools/schemapi/schemapi.py instead, and then run generate_schema_wrapper.py to sync the results to this file.

[brahn]

Thanks @mattijn ! I believe I've proceeded as you described.

I don't know the origin of the (small) changes the script made to API.rst since they don't seem related to my schema change, but I'm guessing that they are either the result of some prior changes for which generate_schema_wrapper.py wasn't run, or a slight version change in some of the dependencies.

Also I should mention that when I first tried to run generate_schema_wrapper.py I encountered a bug in the m2r library described here, which I resolved by using the patch helpfully offered in that post.

[brahn]

@mattijn @jakevdp just checking back in, please let me know if there's anything I can do to help!

[mattijn]

I've no opinion on this.

I hope others can review this.

If there will not appear any reviewers nor disapprovals I will merge this in two weeks from now.

[joelostblom]

I don't have enough expertise to review this properly unfortunately.

[brahn]

thanks @mattijn !

[brahn]

@mattijn quick follow-up -- forgive my ignorance, how does this factor into the version-release cycle?

[joelostblom]

It is currently not clear when the next release will be. Work is being done (most notably #2684) to have Altair support the latest features in VegaLite 5 and this will likely results in a major release eventually. Although I could see an argument for making a minor release that fixes some package compatibility issues and deprecations (e.g. #2650 #2683 #2686), I think we also want to focus our efforts so I am not sure that will happen.

[brahn]

@joelostblom understood, thx!