[issue3745] _sha256 et al. encode to UTF-8 by default

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

gpolo gave me the solution to restore a deleted message:
http://bugs.python.org/issueXXXX?@action=edit&@add@messages=MSGNUM

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<http://bugs.python.org/issue3745>
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