Boolean returns true or false with equal probability.

Geometric returns a float64 that counts the number of Bernoulli trials until the first success for a success probability of 0.5.

I63n returns an integer from the set {0,...,n-1} uniformly at random.

Normal returns a normally distributed float with mean 0 and standard deviation 1.

Sign returns +1.0 or -1.0 with equal probabilities.

U64 returns a uniformly random uint64.

U8 returns a uniformly random uint8.

Uniform returns a float64 from the interval (0,1] such that each float in the interval is returned with positive probability and the resulting distribution simulates a continuous uniform distribution on (0, 1].