nl_tokens: bad behavior when set fails in non - strict mode
pl_tokens: function ( ) { self . log ( "enumerate" ) ; var result = [ ] , keys , i , name , desc ; stm . recordRead ( self ) ; keys = handler . getPropertyNames ( ) ; for ( i = 0 ; i < keys . length ; i += 1 ) { name = <mask> [ i ] ; desc = handler . getPropertyDescriptor ( name ) ; if ( undefined !== desc && desc . enumerable ) { result . push ( name ) ; } } return result ; }