AFAIK, your approach is the only solution given your requirements. It
works well...I've used it often, but usually for integers. Maybe
there is a missing operator for arrays kinda similar to the contains
operator that would be btree indexable.
Yes, I also think that an array prefix equality operator would be good to have... but now that I've found it in the documentation that this solution can be relied on (see my other mail), I can work around the lack of that.
Thanks,
Denes Daniel