4 ms·

If you're saying canonicalise(canonicalise(name)) is not the same as canonicalise(name), that's going to be seriously bug-prone. Idempotence ftw.

• deleted 13y ago
  [deleted]
• spicyj 13y ago
  That's exactly what they describe as the cause of the bug. They intended for the function to be idempotent but it wasn't because of a misunderstanding with the Python library spec.
  • Xorlev 13y ago
    Worse, it /did/ work that way in Python 2.4 but Python 2.5 stopped throwing an exception for invalid codepoints which broke the Twisted library which broke their canonicalization function.
• sanderjd 13y ago
  You should read the article. It prominently features a very interesting description of precisely why their `canonicalise` function turned out to not be idempotent, even though it was meant to be.
• frogpelt 13y ago
  I see you came here for the comments. You should check out the post. It seems relevant.