Issue a warning as this is a behavioural change that can lead to subtle code breakage of currently working code, in the same way that the previous behaviour could easily lead to bugs in general.

Resolves #1602.

ENH: update test skip list for pypy

Delete trailing spaces

use compiled Cython for appveyor build: we compile it anyway so that is what we should test (and it speeds up the tests)

Vector cleanups

interator (true as of C++11)

C++ fixes

Add --src flag to add c/c++ src files (cythonmagic)

Fix Includes/Deprecated not included in Windows wheels

Optimize string comparisons

Use their hashes, if initialized, to short-circuit the "not-eq" path.

Should speed up comparisons of interned strings.