This Sidekiq build is failing due to a spec that expects a thread to be dead and therefore Thread#status to return false.

https://travis-ci.org/mperham/sidekiq/jobs/443494780

The Thread#status return values are documented here and "dead" is not one of them:

https://ruby-doc.org/core-2.3.0/Thread.html#method-i-status

I can't reproduce this locally, the specs pass for me on 9.1.6.0, 9.1.17.0, and 9.2.0.0.