package gen

import "math/rand"

// Generate a random uint64 with an even distribution of bits.Len64()
func RandBiasedUint64() uint64 {
	// The shift-right by up to 64 (shifting it to 0) makes up for randomness
        // lost by setting the high bit.
	return (rand.Uint64() | 0x8000000000000000) >> rand.Int31n(65)
}