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Shouldn’t actionpack/lib/action_controller/legacy/layout.rb:203 be to_s, not to_str? And that’ll Fix The Everything (well, most of it)!
This was broken quite a while ago on Jan 27th, commit a1ac635d9655cd26f86593263c3e9b956d330141, Josh Peek.
My last commit fixed the gem loading issue. Had nothing to do with the
last few 
