gistfile1.txt

class Foo
  def initialize(options)
    @bar = options.fetch(:bar, nil)
    @baz = options.fetch(:baz, nil)
  end
end

def Foo(options)
  Foo.new(options)
end

ruby-1.9.2-p290 :028 > f = Foo bar: 'chuck', baz: 'testa'
=> #<Foo:0x007ffdd407fec0 @foo="chuck", @bar="testa">

Ahhh. That's an important catch. Cool!