[Pyrex] [Bug?] Pyrex cannot convert python object to unsigned char?

[Alexander Belchenko]

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Simple example:

cdef extern "module.h":
    void c_func(unsigned char pixel)

class Foo(object):

    def write_pixel(self, unsigned char pixel):
        c_func(pixel)

When I try to compile this code I got error:

foo.pyx:6:26: Cannot convert Python object argument to type 'unsigned char'

If I change `unsigned char` to `unsigned short` then code translated without errors.
Is it known bug or feature?
I use Pyrex 0.9.5.1a on win32.

[µ]
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