• Minor versions of PyPy are supported in the python configuration. For example, keys like pypy-2.7 and pypy-3.7 are supported in addition to pypy2 and pypy3. #49, #50
• The python configuration supports versions only with a major part. For example, keys like 2 and 3 are supported. #51
• testing extras_require doesn't try to install black on PyPy #51