[Haskell-beginners] randmomR produces only even values

[Dominic Steinitz]

> http://article.gmane.org/gmane.comp.lang.haskell.beginners/15925

I do think this is a flaw and catches many people out despite apparently
being well documented. And it's something one probably wants e.g. to run
multiple Markov Chain Monte Carlo simulations in parallel.

Some further information here:
https://github.com/haskell/random/issues/30#issuecomment-153647055

Dominic