ruby-concurrency/concurrent-ruby — pull request #129 by sheaney (2014-06-27 01:15:12+00:00)
Title: "num_threads" should be "overflow_policy" as the former is unused

I was using the `CachedThreadPool` in a project and wanted to see the source code and came across an unused `num_threads` option which in this case I think should be `overflow_policy`.

Just wanted to provide that quick fix.