[3.12] gh-124958: fix asyncio.TaskGroup and _PyFuture refcycles (#124959)

[graingert]

• Issue: refcycles in exceptions raised from asyncio.TaskGroup #124958

[1st1]

What's this DO NOT MERGE label business?

[graingert]

What's this DO NOT MERGE label business?

@1st1 this was related to a failure on 3.14 (main) caused by a conflict with a different PR #124392

The do not merge label was added out of an abundance of caution assuming this PR was flaky when it is not. I removed the label

[gvanrossum]

What's this DO NOT MERGE label business?

@1st1 this was related to a failure on 3.14 (main) caused by a conflict with a different PR #124392

The do not merge label was added out of an abundance of caution assuming this PR was flaky when it is not. I removed the label

Sure, but please understand not everyone is aware of the reasons, so next time please add a comment to explain. (Also my pet peeve for revert PRs, too few people don’t say why it is being reverted and the OP has to hunt for the reason.)