[erlang-questions] base64 url-safe encoding

[damien morton]

RFC 4648 defines a "URL and Filename safe" base 64 alphabet, which
replaces '+' with '-' and '/' with '_'.

Would anyone have any objections if I added support for this into the
base64 module?

I'm adding in safe_encode(), safe_decode(), safe_encode_to_string(),
and safe_decode_to_string() functions.

How should I submit my patch?
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