Can't create lal.LIGOTimeGPS with numpy.int32

I'm seeing the following error when trying to build a LIGOTimeGPS using numpy.int32, actually anything except numpy.int64 (python2.7):

>>> import lal
>>> import numpy
>>> lal.LIGOTimeGPS(numpy.int64(100))
LIGOTimeGPS(100, 0)
>>> lal.LIGOTimeGPS(numpy.int32(100))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: in method 'new_LIGOTimeGPS', argument 1 of type 'struct tagLIGOTimeGPS const *'

Having the ability to create LIGOTimeGPS from all numpy integer types would be helpful, in general.

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