Why did one of Wilco's patches land into an untitled series?

[DJ Delorie]

> Subject: [PATCH v12 12/31] string: Improve generic strnlen with memchr
> From: Wilco Dijkstra via Libc-alpha <libc-alpha@sourceware.org>
> Reply-To: Wilco Dijkstra <Wilco.Dijkstra@arm.com>

No "Re:", not a reply.

Patchwork seems to rely on the "Re:" in the subject...

* you need to remove the Re: if you're sending a v2 or it shows up as a
  review of v1.

* apparently if you accidentally omit the Re: it becomes a new series if
  it even remotely includes a patch of some sort.