@classmethod implementation leaves first argument with incorrect type

[scoder]

cdef class TypeWithFactory:
    @classmethod
    def new(type cls):
        return cls.__new__(cls)

assigns the type TypeWithFactory to cls, instead of type.

Also, the parameter declaration as type shouldn't be necessary, as Cython should know that it must be a subtype of TypeWithFactory anyway.

[scoder]

Retargeting to 0.12.1 as this isn't likely enough to cause trouble (and trivial enough to fix) to make it worth delaying 0.12 for it.

[scoder]

A "should work in most cases" fix is here:

 http://hg.cython.org/cython-devel/rev/016f79ac7df1