Detect subclasses of dict/tuple/list, fixes #87

tests/test_create.py

@@ -621,6 +621,7 @@ def test_create_index_if_not_exists(fresh_db):
         ["list with", "two items"],
         {"dictionary": "simple"},
         {"dictionary": {"nested": "complex"}},
+        collections.OrderedDict([("key1", {"nested": "complex"}), ("key2", "foo"),]),
         [{"list": "of"}, {"two": "dicts"}],
     ),
 )