use better complex converters

Author: flexatone

src/methods.c

@@ -560,7 +560,7 @@ isna_element(PyObject *m, PyObject *args, PyObject *kwargs)
     }
     if (PyArray_IsScalar(element, Complex64)) {
         npy_cfloat val = PyArrayScalar_VAL(element, Complex64);
-        return PyBool_FromLong(isnan(npy_creal(val)) || isnan(npy_cimag(val)));
+        return PyBool_FromLong(isnan(npy_crealf(val)) || isnan(npy_cimagf(val)));
     }
     if (PyArray_IsScalar(element, Complex128)) {
         npy_cdouble val = PyArrayScalar_VAL(element, Complex128);
@@ -569,7 +569,7 @@ isna_element(PyObject *m, PyObject *args, PyObject *kwargs)
     # ifdef PyComplex256ArrType_Type
     if (PyArray_IsScalar(element, Complex256)) {
         npy_clongdouble val = PyArrayScalar_VAL(element, Complex256);
-        return PyBool_FromLong(isnan(npy_creal(val)) || isnan(npy_cimag(val)));
+        return PyBool_FromLong(isnan(npy_creall(val)) || isnan(npy_cimagl(val)));
     }
     # endif