[issue1738] filecmp.dircmp does exact match only

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

As you are working on this, please consider changing
self.hide+self.ignore in phase0 to chain(self.hide, self.ignore) where
chain should be imported from itertools. There is no need to create the
combined list (twice!) and not accepting arbitrary iterables for hide
and ignore seems to be against the zen of python.

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