There were a number of performance improvements in Obj-C 2.0
One of them was loop optimization.
In order for this optimization to work, you can't change (mutate) a
collection while iterating through it with an enumerator.
I.E.: you can't add/delete items in an array or dictionary (change
the count) while looping through it - that's what the message below
is saying.
It's always been very dangerous to modify a collection while
enumerating it. It's just the logging that's new in Leopard.
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