whole_func_string: function(attributes_only) {
        var keys = [];
        for (var property in this) {
          if (!_isFunction(this[property]) || !attributes_only) {
            keys.push(property);
          }
        }
        return keys;
      }
func_code_string: function(attributes_only) {
        var keys = [];
        for (var property in this) {
          if (!_isFunction(this[property]) || !attributes_only) {
            keys.push(property);
          }
        }
        return keys;
      }
func_documentation_string: Returns an array of keys for this object. If `attributes_only` is true will not return keys that map to a `function()`