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Process#kill: Unknown signal: EXIT (ArgumentError) #1474
This was originally caught in this Rack spec https://github.com/rack/rack/blob/master/test/spec_server.rb#L146 then https://github.com/rack/rack/blob/master/lib/rack/server.rb#L445.
There is no issue under MRI (Ruby 2.5.3). Something about
Thanks for reporting this. It looks like there's no signal with value 0. Ruby uses a special name of "EXIT" for it, but otherwise it doesn't have a name. Calling