Homebrew/homebrew — pull request #28972 by alexeymuranov (2014-05-05 15:03:39+00:00)
Title: Use #+ instead of #join to define Pathname#/

IMO `Pathname#/` should take a single argument. See also [this revision of MRI source](https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/45826/diff/ext/pathname/lib/pathname.rb).