Hello, I'm working on adding support for the bool dtype for sparse matrices. But I'm having some problems I'm adding a wrapper for the npy_bool type. I've included a file called bool_ops.h which basically contains: typedef npy_int8 npy_bool_wrapper; ( https://github.com/cowlicks/scipy/blob/swig-sandbox/scipy/sparse/sparsetools... ) Then I included bool_ops.h and the wrapper npy_bool_wrapper in sparsetools.i and numpy.i where I thought it was necessary. So that the typemaps for the npy_bool type are generated. You can see this in my branch: in sparsetools.i https://github.com/cowlicks/scipy/blob/swig-sandbox/scipy/sparse/sparsetools... https://github.com/cowlicks/scipy/blob/swig-sandbox/scipy/sparse/sparsetools... https://github.com/cowlicks/scipy/blob/swig-sandbox/scipy/sparse/sparsetools... in numpy.i https://github.com/cowlicks/scipy/blob/swig-sandbox/scipy/sparse/sparsetools... https://github.com/cowlicks/scipy/blob/swig-sandbox/scipy/sparse/sparsetools... However I still get the same error seen before in ticket #1533 ( https://github.com/scipy/scipy/issues/2058) TypeError: Array of type 'byte' required. Array of type 'bool' given Which is not what I expected because the typemaps for bool type should now be generated. Could the order in INSTANTIATE_ALL be the problem? ( https://github.com/cowlicks/scipy/blob/swig-sandbox/scipy/sparse/sparsetools... ) Why is order important here? I included npy_bool_wrapper where I did because the Numpy C api says npy_bool is an unsigned char. I'm currently trying to reorder INSTANTIATE_ALL to make things work. Thanks in advance,