Hi Chris. We found a problem with WeakOrderedCollection in Pharo which may cause problems in Magma users in Pharo. Basically, once a WeakOrderedCollection needed to #grew, it stops being weak because the internal array was replaced by a Array instead of a WeakArray.
(WeakOrderedCollection new instVarNamed: 'array') class ->>>> WeakArray
(WeakOrderedCollection new grow instVarNamed: 'array') class ->>>> Array
So....I can imagine that some applications running magma may grow a lot due to this bug.
Just to check whether someone is having this bug or not, you may want to execute:
WeakOrderedCollection allInstances select: [:each | (each instVarNamed: 'array') class = Array ]
if you have instances, then that's a problem ;)
To fix it, you can fileine the changes of the issue tracker: http://code.google.com/p/pharo/issues/detail?id=4596
and then you should fix the already created instances.
cheers
ps: I have no idea how much Magma uses WeakOrderedCollection, but I thought it was just worth it to raise a warning.