TYP,MAINT: Explicitly allow sequences of array-likes in np.concatenate
#21106
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Backport of #21102
Closes #20901, alternative to #20903.
Explicitly allow a sequence of array-like objects in
np.concatenate
, rather than just array-likes.Note that this does not fully get rid of all false positives, i.e. heterogeneous tuples of array-likes still aren't accepted due to what appears to be a mypy bug.