[issue17618] base85 encoding

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Forgot to mention, I included an optional keyword argument to support
> the 'btoa' shortcut for sequences of space characters as described in
> the Wikipedia article. However, I'm unsure if any other implementation
> supports this, so might not be worth including it in our
> implementation.

In this issue I would really like to aim for Mercurial/git-like
behaviour: i.e. no special shortcuts, and no armoring ('<~' and '~>').
Also, the base85 alphabet used by Mercurial and git may be different, I
haven't checked.

(by the way, it seems "btoa" has been dead for a long time, I don't
think it's useful as a reference here)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17618>
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