next() {
    // Robert Jenkins' 32 bit integer hash function.
    this.seed = (this.seed + 0x7ed55d16 + (this.seed << 12)) & 0xffffffff;
    this.seed = (this.seed ^ 0xc761c23c ^ (this.seed >>> 19)) & 0xffffffff;
    this.seed = (this.seed + 0x165667b1 + (this.seed << 5)) & 0xffffffff;
    this.seed = ((this.seed + 0xd3a2646c) ^ (this.seed << 9)) & 0xffffffff;
    this.seed = (this.seed + 0xfd7046c5 + (this.seed << 3)) & 0xffffffff;
    this.seed = (this.seed ^ 0xb55a4f09 ^ (this.seed >>> 16)) & 0xffffffff;
    return (this.seed & 0xfffffff) / 0x10000000;
  }
Generates a psuedo-random but deterministic number. Based on the v8 implementation of Math.random for testing.
@see https://github.com/chromium/octane/blob/570ad1ccfe86e3eecba0636c8f932ac08edec517/base.js#L120