Fix ArrayType __eq__ operator so that array types are not duplicated in the registry.

wsme/tests/test_types.py

@@ -318,3 +318,7 @@ class TestTypes(unittest.TestCase):
 
         c = C1(s=six.u('test'))
         assert c.s == six.u('test')
+
+    def test_array_eq(self):
+        l = [types.ArrayType(str)]
+        assert types.ArrayType(str) in l

wsme/types.py

@@ -30,6 +30,9 @@ class ArrayType(object):
     def __hash__(self):
         return hash(self.item_type)
 
+    def __eq__(self, other):
+        return self.item_type == other.item_type
+
     @property
     def item_type(self):
         if isinstance(self._item_type, weakref.ref):