Example of how to handle varying method argument signatures across Rubies 2.2 - 3.0 and jRuby using ruby2_keywords. Run using Ruby's warn flag like so:

_output.txt

>> ruby -w delegating.rb
Foo says...
["hello", "world"]
========================================
Bar says...
["yo", "world"]
{}
****************************************
Foobar says...
"howdy"
"folks"
########################################
********************************************************************************
Tracing Foo
Foo says...
["hello", "world"]
========================================
Tracing Bar
Bar says...
["yo", "world"]
{}
****************************************
Tracing Foobar
Foobar says...
"howdy"
"folks"
########################################

delegating.rb

class Foo
  def speak(*args, &block)
    puts "Foo says..."
    puts args.inspect
    yield
  end
end

class Bar
  def speak(*args, **kwargs, &block)
    puts "Bar says..."
    puts args.inspect
    puts kwargs.inspect
    yield
  end
end

class Foobar
  def speak(what, how:, &block)
    puts "Foobar says..."
    puts what.inspect
    puts how.inspect
    yield
  end
end

Foo.new.speak("hello", "world") { puts "=" * 40 }
Bar.new.speak("yo", "world") { puts "*" * 40 }
Foobar.new.speak("howdy", how: "folks") { puts "#" * 40 }

def trace_the_speaker speaker_class
  speaker_class.class_eval do
    def speak_loudly(*args, &block)
      puts "Tracing #{self.class}"
      speak_normally(*args, &block)
    end
    alias_method :speak_normally, :speak
    alias_method :speak, :speak_loudly
    ruby2_keywords(:speak_loudly) if respond_to?(:ruby2_keywords, true)
  end
end

puts "*" * 80

trace_the_speaker(Foo)
trace_the_speaker(Bar)
trace_the_speaker(Foobar)

Foo.new.speak("hello", "world") { puts "=" * 40 }
Bar.new.speak("yo", "world") { puts "*" * 40 }
Foobar.new.speak("howdy", how: "folks") { puts "#" * 40 }