[[!comment format=mdwn
 username="https://www.joachim-breitner.de/"
 nickname="nomeata"
 avatar="http://cdn.libravatar.org/avatar/a2112893817513537c6a2c228c04c138a2f68bba57121ab7f267de58fc5171d7"
 subject="Code smell in hashing"
 date="2017-05-05T23:51:14Z"
 content="""
Hi Joey,

I looked through http://source.debug-me.branchable.com/?p=source.git;a=blob;f=Hash.hs;hb=HEAD and since this probably scurity-relevant, allow me to be nitpicky:

```
instance Hashable v => Hashable (Maybe v) where
  hash Nothing = hash ()
  hash (Just v) = hash v
```

will hash the distinct values `Just ()` and `Nothing` identically. Maybe you don't have any `Maybe ()` type around, but in that case you should maybe document that requirement.
"""]]