docs: function Underverse(size, cursor) {
    if (!(this instanceof Underverse)) return new Underverse(size);
  
    this.size = size || 10000;            // The size of the backlog.
    this.ring = new Array(this.size);     // The ring we are going to abuse.
    this.position = isNaN(+cursor)        // Current position of the cursor.
      ? 'inactive'
      : +cursor;
  }