Expose a method to remove a stale reference for subclasses that overr… #12
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…ide expungeStaleEntries.
As far as I can tell, there isn't a proper way of a subclass extending and overriding
expungeStaleEntriessince there's no way to actually remove the reference from the map, so it's a guaranteed memory leak. This exposes the removal for subclasses./cc @adriancole