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Replaced `ThreadSafe::Map` with successor `Concurrent::Map`. #21679
This PR depends on a pre-release version of concurrent-ruby (1.0.0.pre2). The original merge of thread_safe happened in 1.0.0.pre1. We will release 1.0.0 before Rails 5 is released. We are not adding new features, just working on performance improvements, better documentation, and other chores. We will schedule a 1.0.0 release date as soon as the Rails team needs us to.
When running the tests there are a few interpreter warnings coming from concurrent-ruby. We will clean those up before the next release. We have an issue open here.
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