anchor.diff:  
   check_bool(undefined, _Fld, _Rec, Acc) ->
       Acc;
  +check_bool(true, _Fld, _Rec, Acc) ->
  +    Acc;
  +check_bool(false, _Fld, _Rec, Acc) ->
  +    Acc;
   check_bool(Val, Fld, Rec, Acc) ->
  -    case string:to_lower(Val) of
  -        "true" ->
  -            Acc;
  -        "false" ->
  -            Acc;
  -        _Other ->
  -            [io_lib:format("Invalid ~p in ~p ~p~sn", [Fld, Rec, Val, "~"]) | Acc]
  -    end.
  +    [io_lib:format("Invalid ~p in ~p ~p~sn", [Fld, Rec, Val, "~"]) | Acc].
   
   check_int(undefined, _Min, _Fld, _Rec, Acc) ->
       Acc;
  
positive.code: 
  testing3() ->
      DIAL = #dial{body=[#number{number="+4455222"}]},
      case is_valid([DIAL]) of
          false ->
              io:format("~p is not valid~n", [DIAL]);
          true  ->
              io:format("Does ~p validate? ~p~n",
                        [DIAL, validate([DIAL])]),
              compile([DIAL])
      end.
  
negative.code: -export([
           testing/0,
           testing2/0,
           testing3/0,
           testing4/0
          ]).
  
  -include("twilio.hrl").
  