anchor.diff:  validate_option(cacertfile, Value) when is_binary(Value) ->
       Value;
   validate_option(cacertfile, Value) when is_list(Value), Value =/= ""->
  -    list_to_binary(Value);
  +    binary_filename(Value);
   validate_option(dh, Value) when Value == undefined;
   				is_binary(Value) ->
       Value;
  
positive.code:     tls_connection_sup;
  connection_sup(dtls_connection) ->
      dtls_connection_sup.
  
negative.code: validate_option(certfile, Value) when is_binary(Value) ->
      Value;
  validate_option(certfile, Value) when is_list(Value) ->
      binary_filename(Value);
  
  validate_option(key, undefined) ->
      undefined;
  