code: function select( state, json, path, isSeekAll ) {
  
          var steps = getSteps( state, path );
          if ( !steps.length ) { return { json: null }; }
  
          var paths = getCachedPaths( state, json );
          var walker = !!paths ? cachedWalk : walk;
          var found = walker( paths || json,
                              isSeekAll ? [] : null,
                              selectStep( steps, isSeekAll ) );
  
          var lastStep = steps[ 0 ].path;
          return {
  
              json: found,
              isFinal: ( isSeekAll ? found.length === 0 : found === null ) ||
                  !!~[ "@id", "@index", "@value", "@type" ].indexOf( lastStep )
  
          };
  
      }
docs: select json for this path