[Yaffs] YAFFS2 - sequence number overflow?

Hello all,

currently I'm trying to familiarise oneself with the YAFFS2 concepts,
especially
the idea, how to accomplish the sequential write restriction of future FLASH
chips.

YAFFS2 uses a 4 byte sequence number to differ older chunks from the latest
one.
This really allows a lot of Blocks to be written, but how does YAFFS handle
a sequence number overflow?

On a 512MB FLASH memory this will surely happen
before reaching the FLASH limitations of about 100 000 Block rewrite
operations,
even with perfect wear leveling.

Is there a mechanism to prevent a sequence number overflow?

Thanks and best regards,
Martin.