R. David Murray added the comment: That wasn't clear. By "something that works" I mean exactly what you are talking about: someone writing code using these functions would naturally try to use None with base64mime, and if we make it work, that would work fine in 2.7.x, but mysteriously break if run on an earlier version of 2.7. So instead we force the author of new code to use a non-None value that will in fact work in previous versions of 2.7.
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