WTF Keyword Args

gistfile1.rb

class MM
  def method_missing(method, *args, **kargs)
    foo(*args)
  end
end

def foo(data, one: 1)
end

MM.new.foo({ foo: 'bar' }, one: 1)
# works fine

MM.new.foo('bar')
# also works fine

MM.new.foo({ foo: 'bar' })
# valid signature, but raises ArgumentError
# this is due to an edge-case with keyword args where if the last value 
# in a method call is a hash the value is passed as keyword args