anchor.diff:  
   -type version() :: 'HTTP/1.0' | 'HTTP/1.1'.
   -type status() :: 100..999.
  --type headers() :: [{binary(), binary()}].
  +-type headers() :: [{binary(), iodata()}].
   
   -include("cow_inline.hrl").
   
  
positive.code: 
  %% @doc Parse the list of headers.
  
  -spec parse_headers(binary()) -> {headers(), binary()}.
  parse_headers(Data) ->
  	parse_header(Data, []).
  
  
negative.code: 
  %% @doc Convert an HTTP version to atom.
  
  -spec parse_version(binary()) -> version().
  parse_version(<<"HTTP/1.1">>) -> 'HTTP/1.1';
  parse_version(<<"HTTP/1.0">>) -> 'HTTP/1.0'.
  
  -ifdef(TEST).
  parse_version_test() ->
  