code: function ensureModelMixin( model, collection, options ) {
          var applyModelMixin;
  
          if ( !model._pickyType ) {
              applyModelMixin = Backbone.Select.Me.custom.applyModelMixin;
  
              if ( applyModelMixin && _.isFunction( applyModelMixin ) ) {
                  applyModelMixin( model, collection, options );
              } else {
                  Backbone.Select.Me.applyTo( model, options );
              }
  
          }
      }
docs: Auto-apply the Backbone.Select.Me mixin if not yet done for the model.  Options are passed on to the mixin. Ie, if `defaultLabel` has been defined in the options, the model will be set up accordingly.