API: Disallow strings in logical ufuncs #21142
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* API: Disallow strings in logical ufuncs This restores pre 1.22 NumPy behaviour for strings passed into logical ufuncs. Logical ufuncs should be able to cast inputs to booleans without modifying their results. Thus they do this now (in NumPy 1.22+). The problem is that string to bool casts are very strange in NumPy currently. This should be reverted/removed once string to bool casts are well defined. But until then, it seems more reasonable to just reject strings. Closes numpygh-20898 Co-authored-by: Ross Barnowski <rossbar@berkeley.edu>
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Backport of #21024.
This restores pre 1.22 NumPy behaviour for strings passed into logical
ufuncs. Logical ufuncs should be able to cast inputs to booleans
without modifying their results.
Thus they do this now (in NumPy 1.22+). The problem is that string to
bool casts are very strange in NumPy currently.
This should be reverted/removed once string to bool casts are well
defined. But until then, it seems more reasonable to just reject
strings.
Closes #20898