docs: function Reader (metaint, opts) {
    if (!(this instanceof Reader)) {
      return new Reader(metaint, opts);
    }
    if (!isFinite(metaint)) {
      throw new TypeError('Reader requires a "metaint" number');
    }
    Transform.call(this, opts);
    this.metaint = +metaint;
    this._passthrough(this.metaint, this._onRawData);
    debug('created new Reader instance with "metaint": %d', this.metaint);
  }