Re: Add support for base64url variant

[Achim Gratz]

Stefan Monnier writes:
>> Base32url is useful for use on case-insensitive filesystems or
>> with case-insensitive protocols.
>
> That's what it's designed for, yes, but I can't think of any example
> where that's useful.  E.g. for case-insensitive filenames, using a hash
> instead of a base32 encoding was a better option in all the cases I've
> encountered because I only needed "one-way" and it conveniently bounds
> the max file name length.

I've used it for sharding into a blobstore on NTFS/SMB (two characters
for first level, so tree width of 1024).  The key is indeed a hash
(SHA512), so the probability of a collision would be low enough to just
ignore the case (for only 512 wide tree), but it felt cleaner to encode
via base32url instead.


Regards,
Achim.
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