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There is indeed a problem - thanks for the report. Rather
than your proposed solution, I would rather add another
internal list, _handlerList, which holds the handlers in
*reverse* order of creation. When shutting down, (a copy of)
this list is used for the iteration rather than
_handlers.keys().

I may remove _handlers in the future - I can't remember why
I made it a dict rather than a list.

Will check into CVS soon, then mark this as Fixed.