[issue20837] Ambiguity words in base64 documentation

[R. David Murray]

R. David Murray added the comment:

There are three different 'base64 alphabets' defined in the standard.  The support for using them is via altchars. 'URL safe' and 'filename safe' are the two alternate alphabets defined in the standard, which you can see if you follow the link to the RFC.

A patch making this more explicit in the base64 docs themselves would almost certainly be accepted.

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nosy: +r.david.murray

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