Hi Stef,
can you put this two patches into the next 3.9a release?
condenseChanges fix is related to http://bugs.impara.de/view.php?id=3737 - this patch doesn't solve all problems of condenseChanges routine but it's better than nothing.
AsyncFile fix simply renames class variable named Error to ErrorCode. The first name collides with global class name.
This will help me to update self-bootstrapping environment for Squeak 3.9 and make its public repository (http://www.squeaksource.com/KernelImage.html) usable.
-- Pavel