code: function _unmask(buffer, mask) {
    // Required until https://github.com/nodejs/node/issues/9006 is resolved.
    const length = buffer.length;
    for (let i = 0; i < length; i++) {
      buffer[i] ^= mask[i & 3];
    }
  }
docs: Unmasks a buffer using the given mask.
  
  @param {Buffer} buffer The buffer to unmask
  @param {Buffer} mask The mask to use
  @public