There is a whole paragraph about WichmanHill at the top of this page
already and (if anything) I think that WichmanHill is less notable
(basically only used in legacy applications). However SystemRandom is
very useful. I don't want to make claims about urandom that I can't back
up, but urandom is very useful and I think that there ought to be some
note of it in the opening for people who want a stronger random
instance. All I'm suggesting is a sentence to point it out. That would
have been enough for me not to have reinvented the wheel.