well, i liked it better refactored, i.e., each piece of code
taking care of one logical part (i.e., one section for __bool__,
another for __len__, and another for the default.
now it's back to the spaghetti it was.

> return PyErr_Occurred() ? -1 : 1;
i hate the trinary expression, but that's all about style :)

anyway, as long as it works, i don't have any complaints.
you just have to make sure it's written as optimized as possible,
because it gets invoked many times behind the scenes.