[issue14043] Speed-up importlib's _FileFinder

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Well, it's the reason you added file size to .pyc files. =)

pyc files only store the integer timestamp. Here I store the original
floating-point timestamp, and I assumed it would be sufficient :)

>  I assume if you store the system clock as well to see if no time has
> changed it would kill the performance gain.

I don't know. I might give it a try but it might still be fragile.

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<http://bugs.python.org/issue14043>
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