// Mulberry32 — fast, deterministic 32-bit PRNG
// Same seed always produces the same sequence
function mulberry32(seed) {
  return function() {
    seed |= 0;
    seed = seed + 0x6D2B79F5 | 0;
    let t = Math.imul(seed ^ (seed >>> 15), 1 | seed);
    t = t + Math.imul(t ^ (t >>> 7), 61 | t) ^ t;
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
  };
}