anchor.diff:  
   -spec uuid_v4() -> binary().
   uuid_v4() ->
  -    iolist_to_binary(uuid:uuid_to_string(uuid:get_v4())).
  +    uuid:uuid_to_string(uuid:get_v4(), binary_standard).
   
   %%--------------------------------------------------------------------
   %% Stanzas from inline XML
  
positive.code: from(Stanza, Recipient) ->
      setattr(Stanza, <<"from">>, escalus_utils:get_jid(Recipient)).
  
  set_id(Stanza, ID) ->
      setattr(Stanza, <<"id">>, ID).
  
  setattr(Stanza, Key, Val) ->
      NewAttrs = lists:keystore(Key, 1, Stanza#xmlel.attrs, {Key, Val}),
  
negative.code:          chat/3,
           chat_to_short_jid/2,
           chat_without_carbon_to/2,
           chat_to_with_id_and_timestamp/2,
           chat_to_with_id/2,
           groupchat_to/2,
           iq_result/1,
           iq_result/2,
  