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I was going to leave just the existing test versions, but I'm puretty sure Dynamic Uno is the only thing that uses this, and it's on Ruby 3, so I added that version 🤷 Lots of tech debt in this repo...
A bunch of tests were failing on Travis when I arrived, so I which was easily fixed by requiring tmpdir: https://app.travis-ci.com/github/aptible/spawn_passthrough/builds/271267645