random: add RNG? type predicate
random: add RNG? type predicate

jckarter/clay,iamrekcah/clay,mario-campos/clay,jckarter/clay,jckarter/clay,mario-campos/clay,iamrekcah/clay,jckarter/clay,jckarter/clay,mario-campos/clay,mario-campos/clay,iamrekcah/clay,mario-campos/clay,iamrekcah/clay,iamrekcah/clay,jckarter/clay