[Lazarus] Typecast set to byte in mode OBJFPC

[Jürgen Hestermann]

Am 2014-12-31 um 16:55 schrieb Joost van der Sluis:
> On 12/31/2014 04:40 PM, Jürgen Hestermann wrote:
>> type FlagType        = (Flag1,Flag2);
>>           FlagSetType   = set of FlagType;
>> var i : SizeInt;
>>        S : FlagSetTyp;
>>
>> S := [Flag1];
>> i := byte(S); // <---- Error "illegal type conversion"
>
> i := ord(S); ?
>
> But it's still invalid, though. A set can contain more then 32 items, and then your conversion does not hold anymore.

It seems that now FlagType is always 4 bytes in size while it was 1 byte in DELPHI mode.
That's a real problem because I have stored (and reread) these sets from a binary file
which now fails because of the larger set size.
Is this realy compiler mode dependent?
I can't find any documentation about this.