[dns-operations] dns response rate limiting (DNS RRL) patch available for testing

[Florian Weimer]

* Paul Vixie:

> Vernon Schryver and Paul Vixie have been working on DNS Response Rate
> Limiting (DNS RRL) as a patch set to BIND9 (9.9.1-P1 or 9.8.3-P1) and we
> are ready for broader external testing.

It seems rather straightforward to force recursive resolvers to hit
the rate limit.  Why isn't this a problem?