Reader provides a random reader that can reset during testing.
var Reader io.Reader
func CryptoRandFloat64() (float64, error)
CryptoRandFloat64 returns a random float64 obtained from the crypto rand source.
func Float64(reader io.Reader) (float64, error)
Float64 returns a float64 read from an io.Reader source. The returned float will be between [0.0, 1.0).