R. David Murray <rdmur...@bitdance.com> added the comment:

My conclusion in working on the email package is that only the first space 
after the ':', if it exists, should be stripped.  That is, even though the RFC 
(for email) reads as if the space after the colon is part of the value, in 
practice it is part of the delimiter, but is optional (and almost always 
present, in email).  Whether additional leading spaces are significant depends 
on why they are there.  Since they are an unusual case, I would choose to 
preserve them on the theory that someone might care, and that someone who 
doesn't care can strip them.

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nosy: +r.david.murray

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<http://bugs.python.org/issue10281>
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