CircleID

It isn't all that hard to do a lame check - Go to http://dnscheck.se and run it.

The code is in perl and easily downloaded.

It would take ICANN only a couple of minutes to create a script that would do this check on every TLD every day and post the results onto a set of web pages.

Recursion can be present with some of the earlier experimental IDN solutions that sent binary on the wire (circa 1998-2000), yet it largely is present as a legacy issue, where servers require updates to their software and / or configuration.

I ran root-listed nameservers for more than 8 years on 4 ccTLDs, and can say that there was little value to allowing recursion.