nl_tokens: Diff two arrays .
pl_tokens: function diffArrays ( arr1 , arr2 ) { if ( ! Array . isArray ( arr1 ) || ! Array . isArray ( arr2 ) ) { return <mask> ; } if ( arr1 . length !== arr2 . length ) { return true ; } for ( var i = 0 , len = arr1 . length ; i < len ; i ++ ) { if ( arr1 [ i ] !== arr2 [ i ] ) { return true ; } } return false ; }