BUG: Fix NaT handling in the PyArray_CompareFunc for datetime and timedelta #20081
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…edelta In numpy#12658 and numpy#15068 the sort ordering for datetime and timedelta was changed so that NaT sorts to the end, but the internal compare array function was not updated. Fixes numpy#19574.
I accidentally based it off the float compare template instead of the integer compare template. It also now properly handles the case when both arguments are NaT.
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Backport of #19607.
In #12658 and #15068 the sort ordering for datetime and timedelta was changed
so that NaT sorts to the end, but the internal compare array function was not
updated.
Fixes #19574.
If a test should be added for this, please let me know where.