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The issue is actually in numpy. In numpy/f2py/src/fortranobject.c, function array_from_pyobj(), there is::
 sprintf(mess,"failed to initialize intent(inout|inplace|cache) array"
 " -- input must be array but got %s",
 PyString_AsString(PyObject_Str(PyObject_Type(obj)))
 );
(In numpy headers, PyString_AsString is aliased to PyBytes_AsString.)
Besides the reference leaks, this function will fail when given the unicode string returned by PyObject_Str(), and sprintf receives the null string...
Please report this to numpy.