Well since 2 days have now gone by without an authority stepping in, I think you might be right! Actually I didn't interpret your suggestion to try elsewhere in a negative way - I appreciate you pointing it out.

I arrived at the decision to post on perlmonks purely from habit - I've been asking the odd question here since 2005. Also I assumed plenty of other perl-mongers would be playing about with raku - and I did perform a site search for raku before I went ahead. It seemed like there were a substantial number of threads that had [Raku] in the title (which I figured was a convention, and so I copied it). However, I admit I didn't explore too deeply.

I thought I'd give it a couple of days before trying elsewhere, to avoid cross posting. However, now I will officially try the raku mailing list, as suggested. If/when I do get the solution, I will post it back here in the event it helps someone else out.