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Forgot to give the Tornado integration the new scopes treatment -- fixing that now.
This integration is a bit special because trying to update it to the new API leads to the tests failing with
when trying to restore the old isolation and current contexts at the end of
with isolation_scope()
. Digging deeper, I came across a Tornado issue. There's a fix in Tornado 6 and also in our case, everything seems to work on 6.0 up, so I'm dropping support for older Tornado to make sure contextvars work correctly. 6.0 itself is already 5 years old so I think we can afford to drop support for older versions.