Clonable

# File lib/more/facets/cloneable.rb, line 40
  def initialize_copy(sibling)
    #first duplicate my superclass' state. Note that if it's duplicating
    #instance variables, this will be overwritten, but this is important
    #because we could be dealing with a C extension with state hidden from
    #the Ruby interpreter
    super

    #we want to know if we're being dup'ed or clone'd, because we want to
    #preserve the state of our internals the same way our state is being
    #preserved. (If we can't figure it out, we'll just use #dup.)
    operation=caller.find{|x| x !~ /'initialize_copy'/}.
      match(/`(dup|clone)'/)[1] or :dup

    sibling.instance_variables.each do |ivar|
      value = sibling.instance_variable_get(ivar)

      #set my instance variable to be a #dup or #clone
      #or my sibling, depending on what's happening to me right now
      instance_variable_set(ivar, value.send(operation))
    end
  end