code: function seekMetadataLRU(self) {
  			while (self._lru <= self._mru && self._metadata.__byIndex__[self._lru] == undefined) {
  				self._lru++;
  			}
  			// The lru should never skip item. So current value should always point to the 1st (numeric order) non-empty
  			// item in self._metadata.__byIndex map
  			return (self._lru <= self._mru);
  		}
docs: Moves the pointer of LRU to the next available (non-empty) item starting from the current position.
  @returns {boolean} true if the seek moved the pointer to an existing item, false - if no item is found