[dns-operations] Cloudflare people here ? Problematic records served from a Cloudflare hosted zone.

[Emmanuel Fusté]

Hello,

With a colleague we found by accident read world records served by 
Cloudflare DNS which are breaking the DNS data model: multiple possible 
CNAME values for a same record leading to possible resolver's cache 
pollution.
As the way to get one value or another is trivial, the way to control 
the resolver cached value is trivial too.
We did not find how Cloudflare DNS features and zone content where 
used/combined to generate this behavior which is surely unexpected for 
the zone operator.
Is there some Cloudflare people here to whom I could provide the 
zone/records details to see if it is an expected/assumed behavior or a 
subtle corner case bug ?

Emmanuel.