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The intended behavior is irrelevant <wink>.  Since this is
how the base64 module works, it needs to be correctly
documented.  It's way too late to be changing this behavior,
as broken as some might think it is.:)

Note that the email package has an RFC 2045-2047 compliant
base64 encoding module called email.base64MIME.  It
currently isn't documented (but will be before 2.3 is released).

Reassigning to Fred so he can correct the base64 documentation.