Do not install typing for Python 3.5 and above #1
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The
typingmodule is included in the standard library since Python 3.5. Additionally, thetypingmodule from PyPI is not compatible with Python 3.7 and causes breakage when e.g. running tests withpytest:python/typing#573
This PR adds an environment marker so that
typingis installed only for older versions of Python that do not provide it in the standard library.