code: function (subset, superset) {
          
          if (   !Arrays.isArrayLike(subset)
              || !Arrays.isArrayLike(superset)
              || subset.length > superset.length )
              return false;
          
          return this._isSubsetOf(subset, superset);
      }
docs: <p>
  Return whether all items of <code>subset</code>
  are found in <code>superset</code>, in any order.
  This function uses the '===' operator to compare
  the items with each other.
  </p>
  
  <p>
  If any of the argument is not an Array,
  this function returns <em>false</em>.
  </p>
  @param subset {Array}
  @param superset {Array}
  @return {Boolean}