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Motivation
The NIO 2.78 release introduced a bunch of new warnings. These warnings cause us a bunch of trouble, so we should fix them.
Modifications
Mostly use a bunch of assumeIsolated() and syncOperations.
Result
CI passes again.
Note that Swift 6 has many more warnings than this, but we expect more to come and we aren't using warnings-as-errors on that mode at the moment. We'll be cleaning that up soon.