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It's mostly just needed to interact with FFI and declare some types as Send/Sync.

We use it in 3 places:

- fixing some FFI on iOS

- enabling function-call syntax for signals (took this implementation from dtolnay)

- implementing Send/Sync for an ID that uses a pointer as a hash (which honestly could be removed in lieu of a usize, now that I'm looking at it)




Oh, OK. That sounds more like stuff you're directly responsible for, and it looks sensible.




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