Suggestion: Use pure-Python implementation as fallback #5
Description
Since there already is a pure-Python impementation used for PyPy, why not also use it as a fallback for when the C implementation isn't available, e.g. if compilation fails?
See for example the setup.py file in the simplejson project, or a simplified version in my fuzzysearch library.
Relevant especially on Windows (though that could also be solved by supplying binary wheels) but also on macOS etc.
Related to issue #1.