THIS CHANGES THE BYTES SENT TO THE CLIENT (intentionally).
UnSmash::Serialize wrote the "duration != 3.0f" flag but guarded the
value with "builderID != 3.0f" (a typo), so the 32-bit duration was
always written, even after a 0 flag. The LEGO Universe 1.10.64 client
(GameMessage::UnSmash::Serialize/Deserialize @ 00dc0e80/00dc0f50,
default 3.0f @ 017e66b4) writes it only when
duration != 3.0f. The client read the flag and ignored the trailing 32
bits, so this removes 4 junk bytes from default UnSmash messages;
messages with a non-default duration are unchanged.
Uses WriteOptional/ReadOptional and adds Deserialize. Verified with
hand computed golden bits for every flag combination and round trips.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
