-+ setfattr($fn, 'rsync.%md4', "$sum4 $size $mtime");
-+ setfattr($fn, 'rsync.%md5', "$sum5 $size $mtime");
++ my $szmt = pack('V2', $size, $mtime); # 32-bits, may truncate
++ setfattr($fn, 'rsync.%md4', $szmt.$sum4);
++ setfattr($fn, 'rsync.%md5', $szmt.$sum5);