nl_tokens: Copies an object .
pl_tokens: function _clone ( value , refFrom , refTo , deep ) { var copy = function copy ( copiedValue ) { var len = refFrom . length ; var idx = 0 ; while ( idx < len ) { if ( value === refFrom [ idx ] ) { return refTo [ idx ] ; } idx += 1 ; } refFrom [ idx + 1 ] = value ; refTo [ idx + 1 ] = copiedValue ; for ( var key in value ) { copiedValue [ key ] = deep ? _clone ( <mask> [ key ] , refFrom , refTo , true ) : value [ key ] ; } return copiedValue ; } ; switch ( type ( value ) ) { case 'Object' : return copy ( { } ) ; case 'Array' : return copy ( [ ] ) ; case 'Date' : return new Date ( value . valueOf ( ) ) ; case 'RegExp' : return _cloneRegExp ( value ) ; default : return value ; } }