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BUG: core: fix NPY_TITLE_KEY macro on pypy#10962
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On Pypy, dictionary keys do not necessarily preserve object identity.This however was assumed by the NPY_TITLE_KEY macro, which relies ondescriptor.c:568 using the same 'title' object both as a dictionary keyas an entry in the tuple inserted.Since the items in the field dict are unique, value identity is howeversufficient for the NPY_TITLE_KEY macro. On PyPy, fix the macro bycomparing values instead.
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Backport of#10860
On Pypy, dictionary keys do not necessarily preserve object identity.
This however was assumed by the NPY_TITLE_KEY macro, which relies on
descriptor.c:568 using the same 'title' object both as a dictionary key
as an entry in the tuple inserted.
Since the items in the field dict are unique, value identity is however
sufficient for the NPY_TITLE_KEY macro. On PyPy, fix the macro by
comparing values instead.