We now explicitly disable it for targets that hasn’t yet been upgraded to ARC. This way, it’s easier to get an overview of which targets hasn’t yet been upgraded and ensures new targets has ARC enabled.
It can happen that we register the same value transformer twice, e.g. if we register it in an initialize method (since these are not guaranteed to only be called once).
This isn’t a problem per se, but there is no reason to create the new instance.
Previously we used ‘dealloc’ to release the array, which is wrong.
Since instances of OakStringListTransformer is normally never released this bug wasn’t affecting anything. But since we have a dealloc, it should be correct.
