Minor strictness increases

setup.cfg

@@ -27,6 +27,9 @@ warn_unused_configs = True
 check_untyped_defs = True
 disallow_untyped_defs = True
 disallow_untyped_decorators = True
+disallow_untyped_calls = True
+disallow_incomplete_defs = True
+no_implicit_reexport = True
 
 [mypy-conf]
 # ignored because on the CI server sphinx type stubs are available somehow, but