nl_tokens: Used in Object . setPrototypeOf polyfill only
pl_tokens: function bindProperty ( o , parent , prop ) { Object . defineProperty ( o , prop , { get : function ( ) { try { return parent [ prop ] ; } catch ( e ) { } } , set : function ( val ) { <mask> { parent [ prop ] = val ; } catch ( e ) { } } , configurable : true } ) ; }