nl_tokens: Ensures that options at least contains propties and values from must if they re not already defined and not null . Differs from underscore by replacing undefined * or null * falsies and only one defaults source allowed .
pl_tokens: function ( options , must ) { if ( must ) { for ( var prop in must ) { if ( options [ prop ] === void 0 || options [ prop ] === null ) { options [ prop ] = must [ <mask> ] ; } } } return options ; }