after it is has been populated and properly configured in order to prevent
window flashing.

guaranteed to be safe interp argument given to the PythonCmd in place
of the Tcl interpreter taken from a PythonCmd_ClientData.

Now uses NULL instead of INVALID_HANDLE_VALUE as invalid map handle
because CreateFileMapping returns NULL when error occurs.

This is needed because the system linker looks in /Library/Framework before
it looks in /System/Library frameworks. Without this patch _tkinter will
be unusable when it is compiled on a system that has Tk 8.5 installed in
/Library/Frameworks (and the Apple 8.4 install in /System/Library/Frameworks)

Do a more exact copy of the final 3.x code to resolve bugs and add
appropriate tests.

Adds tests, switches from list to deque, fixes __reduce__
which was unnecessarily copying __keys.

consistent with the other re module functions.