[issue18778] email docstrings and comments say about Unicode strings

[R. David Murray]

R. David Murray added the comment:

If you mean the code in Charset's __init__, if you change that you'll have backward compatibility issues.  As the code currently stands it is legal to pass in a charset name that is bytes.  And the string path of that if checks that it contains only ASCII characters, a check that is also still required.

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<http://bugs.python.org/issue18778>
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