there is also #clone, which seems faster

on my computer:

fact _ [:n | n isZero ifTrue: [1]
		ifFalse: [n * (fact copy value: (n - 1))]].

[fact copy value: 6] bench
	==> '157928.2143571286 per second.'

fact _ [:n | n isZero ifTrue: [1]
		ifFalse: [n * (fact clone value: (n - 1))]].

[fact clone value: 6] bench
	==> '208975.4049190162 per second.'



Stef