I thought that luminus defaulted to "immutant", but when I run lein new luminus myapp +h2 +cljs +re-frame +swagger I get a jetty based image. Is that normal?

I think that was a recent change.

Eh, could be wrong about that, the docs still say Immutant is the default.

Aha: https://github.com/luminus-framework/luminus-template/commit/9c6c9e26143a6b685c811c732d9cadcb63c7be58

Looks like they switched to using jetty as the default in version 3.37.

Super good catch.

transitioning from 1 to the other is tough though, so its unfortunate.