diff --git a/src/arrays.sip b/src/arrays.sip
index ec587101..8ed5870e 100644
--- a/src/arrays.sip
+++ b/src/arrays.sip
@@ -23,8 +23,22 @@
         // Code to test a PyObject for compatibility
         // Verify that the object is a sequence, but not bytes or unicode
         if (!sipIsErr) {
-            return (PySequence_Check(sipPy) && 
-                    !(PyBytes_Check(sipPy) || PyUnicode_Check(sipPy)));
+            if (PySequence_Check(sipPy) &&
+                    !(PyBytes_Check(sipPy) || PyUnicode_Check(sipPy))) {
+
+                Py_ssize_t i, len = PySequence_Length(sipPy);
+                bool failed;
+                for (i=0; i<len; i++) {
+                    PyObject* item = PySequence_GetItem(sipPy, i);
+                    failed = !PyBytes_Check(item) && !PyUnicode_Check(item);
+                    Py_DECREF(item);
+                    if (failed)
+                        return FALSE;
+                }
+                return TRUE;
+            }
+            return FALSE;
+
         }
 
 
@@ -37,13 +51,13 @@
             // Ensure each item is a bytes or string/unicode object
             if ( !PyBytes_Check(item) && !PyUnicode_Check(item) ) {
                 // raise a TypeError if not
-                PyErr_Format(PyExc_TypeError, 
+                PyErr_Format(PyExc_TypeError,
                              "Item at index %zd has type '%s' but a sequence of bytes or strings is expected",
                              i, sipPyTypeName(Py_TYPE(item)));
                 delete array;
                 Py_DECREF(item);
                 *sipIsErr = 1;
-                return 0;                
+                return 0;
             }
 
             // if it's a string object convert it to unicode first, assuming utf-8
@@ -109,8 +123,21 @@ wxArrayString testArrayStringTypemap(const wxArrayString& arr);
     %ConvertToTypeCode
         // Code to test a PyObject for compatibility
         if (!sipIsErr) {
-            return (PySequence_Check(sipPy) && 
-                    !(PyBytes_Check(sipPy) || PyUnicode_Check(sipPy)));
+            if (PySequence_Check(sipPy) &&
+                    !(PyBytes_Check(sipPy) || PyUnicode_Check(sipPy))) {
+
+                Py_ssize_t i, len = PySequence_Length(sipPy);
+                bool failed;
+                for (i=0; i<len; i++) {
+                    PyObject* item = PySequence_GetItem(sipPy, i);
+                    failed = !PyNumber_Check(item);
+                    Py_DECREF(item);
+                    if (failed)
+                        return FALSE;
+                }
+                return TRUE;
+            }
+            return FALSE;
         }
 
         // Code to create a new wxArrayInt and convert a compatible PyObject
@@ -122,13 +149,13 @@ wxArrayString testArrayStringTypemap(const wxArrayString& arr);
             // Ensure each item is a number object
             if ( !PyNumber_Check(item) ) {
                 // raise a TypeError if not
-                PyErr_Format(PyExc_TypeError, 
+                PyErr_Format(PyExc_TypeError,
                              "Item at index %zd has type '%s' but a sequence of numbers is expected",
                              i, sipPyTypeName(Py_TYPE(item)));
                 delete array;
                 Py_DECREF(item);
                 *sipIsErr = 1;
-                return 0;                
+                return 0;
             }
 
             // Convert to Integer
@@ -182,8 +209,21 @@ wxArrayInt testArrayIntTypemap(const wxArrayInt& arr);
     %ConvertToTypeCode
         // Code to test a PyObject for compatibility
         if (!sipIsErr) {
-            return (PySequence_Check(sipPy) && 
-                    !(PyBytes_Check(sipPy) || PyUnicode_Check(sipPy)));
+            if (PySequence_Check(sipPy) &&
+                    !(PyBytes_Check(sipPy) || PyUnicode_Check(sipPy))) {
+
+                Py_ssize_t i, len = PySequence_Length(sipPy);
+                bool failed;
+                for (i=0; i<len; i++) {
+                    PyObject* item = PySequence_GetItem(sipPy, i);
+                    failed = !PyNumber_Check(item);
+                    Py_DECREF(item);
+                    if (failed)
+                        return FALSE;
+                }
+                return TRUE;
+            }
+            return FALSE;
         }
 
         // Code to create a new wxArrayDouble and convert a compatible PyObject
@@ -195,13 +235,13 @@ wxArrayInt testArrayIntTypemap(const wxArrayInt& arr);
             // Ensure each item is a number object
             if ( !PyNumber_Check(item) ) {
                 // raise a TypeError if not
-                PyErr_Format(PyExc_TypeError, 
+                PyErr_Format(PyExc_TypeError,
                              "Item at index %zd has type '%s' but a sequence of numbers is expected",
                              i, sipPyTypeName(Py_TYPE(item)));
                 delete array;
                 Py_DECREF(item);
                 *sipIsErr = 1;
-                return 0;                
+                return 0;
             }
 
             // Convert to a Float