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ENH: Show unit information in repr for datetime64("NaT") #29396

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Unlike timedelta objects, datetime64 does not display its unit in the repr output (see numpy#28496).
To maintain backward compatibility, this change adds unit information only when the datetime64 object has a NaT value.
@riku-sakamoto riku-sakamoto marked this pull request as ready for review July 19, 2025 08:53
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BUG: np.datetime64("nat", "ms") does not use unit in repr (unlike timedelta)
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