[IronPython] Problems in module binascii

[Carlos Alberto Costa Beppler]

Hello.

The function crc32 contained on module binascii requires 2 arguments,
but the python docs says that the second argument is optional.

Then a was looking for the implementation and found it in binascii.cs
file on IronPython.Modules. But the implementation of this function
and others (a2b_qp, b2a_qp, a2b_hqx, rledecode_hqx, b2a_hqx and
crc_hqx) are implemented to throw NotImplementdException.

Is this a bug or this module is not supported on IronPython?