I just think getting the safety boiler plate right on callAsync is general such a pain it’s not worth doing.
The MultiAsyncUpdater class I posted avoid we use a lot to avoid the pitfalls 
Yeah, that would force you to have the MultiAsyncUpdater as a member which guarantees safety over a lot of these lifetime problems.
I’d like to point out for clarity though, none of the techniques discussed here are suitable for use in real-time threads. This is only for background worker threads.
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