I don't know if Ryan and the rest of the Deno team are lurking here, but given "Anchored on the robust capabilities of FoundationDB" what I think would be absolutely fricking cool is to get full access to the underlying FoundationDB engine, which would surface the "model any data model you want the way you want it" capabilities of FoundationDB directly to Deno developers.
In case anyone wonders what this would make possible out of the box: https://apple.github.io/foundationdb/design-recipes.html