About FileSystems write preconditions

[Paulo Levi]

I don't know if this was taken into account in the design (excuses if it
has, and i just missed it) , but all filesystems have non portable filename
restrictions, eg: not > 256 length, forbidden characters etc. I was just
wondering if there was a way to get these preconditions so i can derive a
(likely) valid filename automatically.

The reason is that the input is often not user or native filesystem
supplied (though i probably can make him do those adjustments himself by
showing a file chooser in those cases by detecting the failure early).
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