anchor.diff:  def render(data)
     return '# No data to render' if !data or data.empty? or !data.is_a?(Hash)
     stream = ''
  -  data.each{|k,v|
  +  remove_knocked_out_keys(data).each{|k,v|
       stream = stream << recursive_render(k, v)
     }
     stream
  
positive.code:   if value.is_a?(Hash)
      subdent = indentation + 1
      stream << "#{promotion}#{key} {\n"
      value.each{|k,v| stream << recursive_render(k, v, subdent) }
      stream << "#{promotion}}\n"
    elsif value.kind_of?(Array)
      value.each{|v| stream << recursive_render(key, v, indentation) }
  
negative.code: # !include* directives are written as-is with one exception:  the conf.d
  # directory is required and will always be written as a !include directive.
  # To render more than one of any directive, use an Array of it.
  #
  # Special Note:
  # This rendering engine offers something that the deep_merge gem fails to:  the
  # ability to knock-out entire key-value tuples, not just array elements or hash
  # values (leaving the key behind with no value).  Simply prefix your key with
  # the standard knock-out prefix, --, and it will be entirely removed from the
  # rendered result.  At this time, there is no way to query lookup_options for
  # custom definitions of knockout_prefix, so you must use -- for this extension
  # to have any idea what you're trying to do.  Example:
  #   source = {:--x => ''}
  #   dest   = {:x => [1,2,3]}
  #   dest.ko_deep_merge!(source)
  #   Results: {}
  ################################################################################
  
  ###
  