Issue 4101: Missing type in "types" module

Hello

There's a type missing in the standard "types" modules (or I didn't find
it, in what case I apologize for this useless posting)

Consider this code:

---
WrapperDescriptorType = None

class Meta(type):
    def __init__(cls, *args, **kwargs):
        global WrapperDescriptorType
        type.__init__(cls, *args, **kwargs)
        WrapperDescriptorType = type(cls.__init__)

class A:
    __metaclass__ = Meta
---

I could not find WrapperDescriptorType in types module.

btw, I have to pass this descriptor to another function. But in fact I
don't need the wrapper but the real method. How to get it ?