BUG: add a special case for StringDType in np.isdtype (#32030) - #32119
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Backport of #32030.
PR summary
Fixes #27545.
I don't see a cleaner way to fix this without just adding a special case in the error path. This function is only for built-in NumPy DTypes so it would be a bigger change to just make it return True if it's handed a dtype or dtypemeta instance, which is probably a more principled fix.
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