avoid warning in case where code previously behaved correctly

Cython/Compiler/ExprNodes.py

@@ -3466,7 +3466,8 @@ class IndexNode(_IndexingBaseNode):
 
     def analyse_as_pyobject(self, env, is_slice, getting, setting):
         base_type = self.base.type
-        if self.index.type.is_unicode_char:
+        if self.index.type.is_unicode_char and base_type is not dict_type:
+            # TODO: eventually fold into case below and remove warning, once people have adapted their code
             warning(self.pos,
                     "Item lookup of unicode character codes now always converts to a Unicode string. "
                     "Use an explicit C integer cast to get back the previous integer lookup behaviour.", level=1)