docs: function PathLimit( parent, conf ) {
          this._parent = parent;
          
          // console.log('PathLimit', conf );
  
          if ( regPathLimit.test( conf ) ) {
              conf = regPathLimit.exec( conf );
  
              this._start = conf[1];
              this._limit = conf[2];
          }
          else {
              this._start = conf;
          }
      }