docs: function(b1, b2) {
    var mismatch = 0;
    mismatch |= !(b1 instanceof Buffer);
    mismatch |= !(b2 instanceof Buffer);
    mismatch |= b1.length !== b2.length;
    if (mismatch === 1) {
      return false;
    }
    var n = b1.length;
    for (var i = 0; i < n; i++) {
      mismatch |= b1[i] ^ b2[i];
    }
    return mismatch === 0;
  }