DEPR: Index.insert dtype-inference

[jbrockmendel]

• closes API: Index.insert too much dtype inference #51363 (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

Doesn't have a "do X to avoid this warning, not sure if this merits future option or temporary keyword.

[jbrockmendel]

Its kind of annoying that this warning gets issued (the PR currently suppress it) in frame_or_series[new_key] = val. any preferences on whether to warn there?

[github-actions]

This pull request is stale because it has been open for thirty days with no activity. Please update and respond to this comment if you're still interested in working on this.

[jbrockmendel]

@phofl thoughts on doing this? i think there was some vague similarity to some of what you were working on. main open question here is whether to continue suppressing warnings on setitem-with-expansion

[phofl]

thx @jbrockmendel

[jbrockmendel]

Glad to get movement here, but i was hoping for some discussion of whether suppressing the warning in setitem-with-expansion was the way to go

[phofl]

I wouldn’t want to warn there, I don’t think that anyone cares about inference there and getting rid of it is a pain