require 'benchmark'
class Object
def foo(*args, **kw) bar(*args, **kw) end
ruby2_keywords def baz(*args) bar(*args) end
def bar(*args) args end
end
h = {a: 1}
puts(Benchmark.measure do
  100000.times do
  foo()
  foo(**h)
  foo(1)
  foo(1, **h)
end
end)

puts(Benchmark.measure do
  100000.times do
  baz()
  baz(**h)
  baz(1)
  baz(1, **h)
end
end)