Hi,

> However, random numbers are tricky, and I'm suspicious of just
> adding a new operation ad hoc when I don't understand how the
> underlying PRNG works. Hence, I'd appreciate if anyone could
> offer some insight on whether the above approach has any hidden
> pitfalls (i.e. some sort of regularity that might appear when the
> values from two generated streams are combined in a particular
> fashion), or if there is a faster way of generating new generators
> robustly. Random.State.make invokes Digest.string for every int of
> the seed, so it seems like overkill.

Have you considered using Cryptokit's Random module?  It offers
many generators, one of which meets your determinism criteria.

Cheers,
Dario Teixeira