Preserve context vars for sync tasks #483
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Fixes #482
Run sync tasks within copied context.
This is heavily inspired by starlette's
run_in_threadpool
functionintroduced in encode/starlette#192.
Nowadays, starlette is just using anyio.to_thread.run_sync, which does a bunch of extra stuff too,
but from my (limited) understanding,
introducing that would require some changes to the architecture of the project itself 🤔. IDK.