The wrapper is useful for C code which used PyMethod_New(func, NULL,
type) in 2.5. W/o a wrapper people may have to rewrite and redesign
their code base.

For example see http://bugs.python.org/issue1505 and r59215. I had to
rewrite a good bunch of code just to get one C function right.

I'm +1 to add a wrapper and +0 to expose it to Python code and -0 to
expose it as built-in. I used a built-in for quick testing.