Use dict versioning in Py3.6+ to make the lookup of Python module globals almost as fast as C globals.

Allow access to long/int internals (and other builtin types).

CYTHON_CACHE_DIR should also set the compiler cache

This fixes #1399.

This fixes #1393.

so far only the inline cache looked at that environment variable

Use dict versioning in Py3.6+ to reduce the overhead of checking for the "C-line in tracebacks" runtime option.

Closes #1771.

Bug fix for boolean return using statement with internal commas.

Avoid uninitialised C variable (and thus potentially undefined behaviour), even if it's not actually being used in that case.

Improve libcpp.unordered_map API

Add zip_safe=False to userguide setup.py

Misc. typos

Closes #2194.

Closes #2193.