> > Right, but that doesn't contradict what I wrote about adding
> > env vars to fix a seed and optionally enable using a random
> > seed, or adding collision counting as extra protection for
> > cases that are not addressed by the hash seeding, such as
> > e.g. collisions caused by 3rd types or numbers.
> 
> ... at least I hope not :-)

I think the env var part is a good idea (except that -1 as a magic value
to enable randomization isn't great).