code: function (array, value) {
          _gpfAssert(array instanceof Array, "gpf.set must be used with an Array");
          if (undefined === _gpfArrayTest(array, value)) {
              array.push(value);
          }
          return array;
      }
docs: /*
  Inserts the value in the array if not already present.
  
  @param {Array} array
  @param {*} value
  @gpf:chainable