updated from Atlas

attic/strings-bytes/casefold_demo.py

@@ -0,0 +1,19 @@
+import sys
+from unicodedata import name, normalize
+
+changed = 0
+assigned = 0
+for i in range(sys.maxunicode):
+    char = chr(i)
+    char_name = name(char, None)
+    if char_name is None:
+        continue
+    cf = char.casefold()
+    assigned += 1
+    if cf != char.lower():
+        cf_display = ' '.join(cf)
+        cf_names = ';'.join(name(c) for c in cf)
+        changed += 1
+        print('%4d U+%04x' % (changed, i), char, cf_display, char_name + ' -> ' + cf_names, sep='\t')
+
+print(changed, '/', assigned, '=', changed/assigned*100)