improve Python compatibility in pyregr tests

runtests.py

@@ -852,7 +852,7 @@ class CythonPyregrTestCase(CythonRunTestCase):
         CythonRunTestCase.setUp(self)
         from Cython.Compiler import Options
         Options.error_on_unknown_names = False
-        Options.directive_defaults['binding'] = True
+        Options.directive_defaults.update(dict(binding=True, always_allow_keywords=True))
 
     def _run_unittest(self, result, *classes):
         """Run tests from unittest.TestCase-derived classes."""