[issue39154] "utf8" not always a synonym for "utf-8" in lib2to3

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +benjamin.peterson
stage:  -> test needed
versions: +Python 3.9 -Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39154>
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