docs: function _msb(word) {
    word |= word >> 1;
    word |= word >> 2;
    word |= word >> 4;
    word |= word >> 8;
    word |= word >> 16;
    word = (word >> 1) + 1;
    return multiplyDeBruijnBitPosition[(word * 0x077CB531) >>> 27];
  }