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The documentation for 
copyreg.pickle(type, function, constructor=None)
has the sentence
"TypeError will be raised if *object* is a class or *constructor* is not callable."
It's not clear to me what "object" refers to. I believe it refers to the first arg (called ob_type in 2.x) and classic classes which were handled with
def pickle(ob_type, pickle_function, constructor_ob=None):
 if type(ob_type) is _ClassType:
 raise TypeError("copy_reg is not intended for use with classes")
in 2.x If I'm right the above sentence should become.
"A TypeError will be raised if *constructor* is not callable."
in 3.x. If I'm wrong please think of way to express the intended meaning more clearly.
Another minor change: class C need not inherit from object explicitly in 3.x.