Since Foreman 2.0 the Smart Proxy (AKA Foreman Proxy) runs via the rh-ruby25 software collection on EL7 (see RFC: Moving Foreman Proxy, Installer and NodeJS to SCLs). Both Debian Buster and Ubuntu Bionic also ship Ruby 2.5. This means that as a developer you can drop all the compatibility code and start using newer features. Since 2.0 has branched already, this hasn’t happened in smart-proxy itself, but plugins are not tied to the release cycle and can do this today. For Smart Proxy we welcome PRs doing the same.
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Tighter Rubocop (2.0) rules are welcomed. 
A lot of 1.9 stuff in there.
The first part is here:
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