Most tips for unicorn for Bundler and Isolate apply to Rainbows! as well.
You need to add "rainbows" to your Gemfile for Bundler and start Rainbows! with:
bundle exec rainbows ...
Isolate "rainbows" and execute the "rainbows" launcher in your isolated GEM_PATH:
Due to the variety of potential dependencies, Rainbows! lazy loads many of its internals, often after the application itself is loaded. This results in more potential to interact badly with sandbox tools that modify the gem environment.
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