If one writes doctests within documentation strings of classes and
functions, it's possible to use non-ASCII characters since one can
specify the encoding used in the source file.
But if one wants to combine the documentation and testing, by
writing a text file, and thus use DocFileSuite, it's not possible to use
non-ASCII characters in the tests. This is because there's no way
of specifying which encoding the text file uses. Instead one has to
\-quote all non-ASCII characters, and that makes the tests harder
to read IMHO.
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