Unserialize a previously fb_compact_serialize()-ed data
function fb_compact_unserialize( mixed $thing, inout mixed $success, inout mixed $errcode, ): mixed;
mixed $thing- What to unserialize.
inout mixed $success- Whether it was successful or not.
inout mixed $errcode- One of those FB_UNSERIALIZE_ constants to describe what the decoding error was, if it failed.
mixed- - Unserialized data.