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also local to the current async task (if there is one).
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module - i.e. a value set in an async frame will be visible:
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`gather` and probably others).
- to code scheduled in a sync thread using `sync_to_async`
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data is thread-local, but additionally shared with async code executed
via the `async_to_sync` utility, which schedules async code in a new thread
and copies context across to that thread.
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behaving exactly like `threading.local` if the thread is sync, and as
`contextvars` if the thread is async. This allows genuinely thread-sensitive
code (such as DB handles) to be kept stricly to their initial thread and
disable the sharing across `sync_to_async` and `async_to_sync` wrapped calls.
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