> rt46268 contains a correct fix, though for consistency, would it not be
> better (and perhaps easier?) to cherry-pick parts of commit 03be5a6b4e6
> (Mukund's performance improvements which were not backported to 9.11 and
> older branches)?  E.g. like this:
> 
>     $ git checkout 03be5a6b4e6 bin/tests/system/filter-aaaa/ns*/*.db{,.in}
>     $ git commit

Ah I hadn't noticed those changes. Yes, that should work equally well.

> PS. While v9_10 and v9_11 fail the filter-aaaa system test consistently,
> v9_9 failures are intermittent on Robie (and I cannot reproduce them at
> all on my machine).  Do you know why this is?

Nope.