Make a unique filesystem path, without creating the file

[Chris Angelico]

On Tue, Feb 23, 2016 at 1:27 PM, Paul Rubin <no.email at nospam.invalid> wrote:
>   3) The default token length should be long enough to not have to "change
>   in the future".  If the user wants a shorter token, they ask for that,
>   or can truncate a longer one that they receive from the default.

How much future are you expecting?

ChrisA