lower -> casefold

Justin Baum · Justin Baum · commit e48d79027b66 · 2020-11-29T16:31:52.000-05:00
diff --git a/Lib/doctest.py b/Lib/doctest.py
@@ -1615,8 +1615,8 @@ def check_output(self, want, got, optionflags):
         true_line = "True\n"
         false_line = "False\n"
         if (optionflags & IGNORE_CASE):
-            got = got.lower()
-            want = want.lower()
+            got = got.casefold()
+            want = want.casefold()
             true_line = "true\n"
             false_line = "false\n"
 
