Fortunately pypy provides support for a lot of the CPython API, so the
changes are minimal.
The most important changes are:
- constructors always get a keyword argument dictionary, even if no
keyword arguments are passed
- trying to assign to a read-only attribute raises TypeError instead of
AttributeError
Apart from that, pypy does not provide MAXPATHLEN. There is a hack in
place currently, but there is only place that's using that macro, and
there shouldn't be a need for it much longer.
This fixes #209.
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