Github user ben-craig commented on the issue:
Prior to this change, that was the only way to portably change the detached
state. The PosixThreadFactory didn't have a ctor that would permit that. The
tests were even using this pattern.
I see that you have added a PosixThreadFactory ctor that lets you set the
detached state in a portable way, and that's great. It doesn't change that
this pattern is already out there in a lot of production code. It even broke
tests which made no use of ThreadManager.
If you need to fix the tests after making a change, chances are high that
you have introduced a source breaking change that needs to be strongly
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