to.rb

class To
  def initialize(object)
    @object = object
  end

  def method_missing(method, *args)
    @object.public_send("to_#{method}", *args)
  end
end

class Object
  def to
    To.new(self)
  end
end

puts 5.to.s
puts "13".to.i
puts :foo.to.proc