Reproduction demonstrating a difference in behaviour between MRI and JRuby for keyword arg splats of aliased methods, as discovered in Sinatra 2.2.0

JRUBY.out

╭─{ yaauie@limbo:~/src/elastic/ls (✔ 8.0) }
╰─● (rbenv shell jruby-9.2.19.0; ruby kwargs-splat.rb)
ArgumentError: wrong number of arguments calling `initialize` (given 1, expected 0)
     new at kwargs-splat.rb:7
  <main> at kwargs-splat.rb:17
( rbenv shell jruby-9.2.19.0; ruby kwargs-splat.rb; )  9.23s user 0.53s system 405% cpu 2.412 total
[error: 1]

kwargs-splat-with-alias.rb

class Base
  class << self
    alias new! new unless method_defined? :new!

    def new(*args, **kwargs, &bk)
      instance = new!(*args, **kwargs, &bk)
      $stderr.puts("intercepted creation of `#{instance.inspect}`")
      instance
    end  
  end
end

class Foo < Base
end

$stdout.puts Foo.new

MRI.out

╭─{ yaauie@limbo:~/src/elastic/ls (✔ 8.0) }
╰─● (rbenv shell 2.7.2; ruby kwargs-splat.rb)         
intercepted creation of `#<Foo:0x00007fef0a0f8150>`
#<Foo:0x00007fef0a0f8150>
[success]