Implement len(memoryview) and allow its usage in nogil sections.

Closes #1791.

Closes #1806.

Closes #1733

implement len(cython.view.array) as it seems weird that it is supported for memoryviews but not the array type

Fix a compiler crash when looking up cython.view.array() as a callable function with non-trivial keyword arguments.

Closes #1598.

Closes #1801

Remove a macro from helper code that I find difficult to read. The result is not perfect, but at least it's more visible what get's assigned to what.

use pre-instantiated strings in __Pyx_setup_reduce() to reduce overhead - we will most likely need and indefinitely store them in the types anyway

This fixes #1798.

Suppress special casing of attribute names in closure classes since they are not user defined and any local variable name is allowed without being special.

Closes #1797.

This reverts commit b4fbd9bc.

emacs: use "" as buffer name in indirect buffers

fixes #1743

allow disabling the ABC registration of the Cython Generator and Coroutine types to support compiling the "abc" module in CPython's stdlib itself

skip_win32 doesn't properly skip tests

Minor safety/speed fix to prevent looking for a "__dict__" in an unpickled object if we don't have anything to fill it with in the first place.

Escape another local variable in generated pickle helper function to prevent conflicts with the user defined class name. See #1786.

Don't conflict with a class named 'result' in auto-pickle

Revert "Escape local variables in generated pickle helper functions to prevent conflicts with the user defined class name."

This reverts commit a158967e.