Perhaps in some cases weaker, more manageable mechanisms than
full-powered observers and listeners could be sufficient.
For example, one approach which gets you the right cleanup behavior
without exposing GC, is to have special-case observers which can be
easily proven to be safe to drop. For example, suppose we had:
observerService.addSettingObserver(obj, "dirty", true)
which promises to set obj's 'dirty' property to true. If obj is
collected, this observer can obviously be dropped.
I understand that not every use case can be handled this way; it's
simply not as powerful as calling a function. But certainly every case
that *can* be handled this way should.
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