Python Type Checker Inspection not working for cython files.

I'm using type annotation syntax in Cython File (PEP 0484).

However, type checker code inspection for cython files(.pyx) is not working at all in pycharm.

It works for python, but not cython.

In Settings > Editor > Inspection, there's only entry for python but not cython..
I enabled Type Checker code inspection for python, and make it's severity to 'Error',
but still type checker is not working for cython files.

How can I enable type checker for cython files?

 I created PyCharm issue for this problem with some screenshots included.