anchor.diff:  
   -type qvalue() :: 0..1000.
   -export_type([qvalue/0]).
  +
  +-type websocket_version() :: 0..255.
  +-export_type([websocket_version/0]).
   
   -include("cow_inline.hrl").
   
  
positive.code: horse_parse_sec_websocket_version_req_255() ->
  	horse:repeat(200000,
  		parse_sec_websocket_version_req(<<"255">>)
  	).
  -endif.
  
  
negative.code: 
  %% @doc Parse the Sec-WebSocket-Version request header.
  
  -spec parse_sec_websocket_version_req(binary()) -> websocket_version().
  parse_sec_websocket_version_req(SecWebSocketVersion) when byte_size(SecWebSocketVersion) < 4 ->
  	Version = binary_to_integer(SecWebSocketVersion),
  	true = Version >= 0 andalso Version =< 255,
  