[issue24797] email.header.decode_header return type is not consistent

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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components: +email
nosy: +barry, r.david.murray
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24797>
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