Possible race crash in multi-dispatch around the weak mutable set implementation.

[numist]

Technically an NNKit bug but it's only been discovered here and it needs to get fixed before 0.0.8. Looks like there's a potential race causing a crash in objc_retain when a service dispatches a message using multidispatch and the subscribers/observers are recently dead.

[numist]

Turns out NSHashTable is what I wanted the whole time. NNKit no longer provides nor uses its own internal mutable weak set implementation. The actual change is numist/NNKit@1670a68

For the curious, the tombstone objects in the weak set had a nonatomic weak property referencing the weak member of the collection and that property needed to be atomic to avoid losing races where the object would dealloc between the property getter and the retain/autorelease. Sigh.