ByRef Copy Bug

[anonymous]

In the following script, the presence of ByRef causes $old to be a reference, not a copy.

#include "car.au3"

$car = Car () ; speed: 50

Func getAcceleratedCar (ByRef $car_speed)
	Local $old = $car
	$car_speed *= 2
	Local $new = $car

	Car_printSpeed ($car, "car") ; speed: 100
	Car_printSpeed ($old, "old") ; speed: 100, expected 50
	Car_printSpeed ($new, "new") ; speed: 100

	$car = $old
	return $new
EndFunc

getAcceleratedCar ($car [$Car_Speed])

car.au3:

; class Car
Func Car ($speed = 50)
	Local $__instance [$__Car__ObjectSize] = [$__Car__VTable]
	$__instance [$Car_Speed] = $speed
	return $__instance
EndFunc
Func __Car__printSpeed__Impl (ByRef $__instance, $name)
	ConsoleWrite ("speed of " & $name & ": " & $__instance [$Car_Speed] & @CRLF)
EndFunc
Func Car_printSpeed (ByRef $__instance, $__arg1)
	Local $function = ($__instance [$__Car__VTableIndex]) [$__Car__printSpeed__Index]
	Return $function ($__instance, $__arg1)
EndFunc
Const $__Car__VTableIndex = 0
Const $__Car__VTable = [__Car__printSpeed__Impl]
Const $__Car__printSpeed__Index = 0
Const $__Car__ObjectSize = 2
Const $Car_Speed = 1
; end class Car