[issue13420] newer() function in dep_util.py discard changes in the same second

[Éric Araujo]

Éric Araujo added the comment:

For 3.6 and 3.7, we can avoid the original float resolution issue thanks to stat_result.st_mtime_ns.  Not sure if 2.7 should be changed.

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<https://bugs.python.org/issue13420>
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