How does one distribute rules over multiple ns's? mk-session seems to imply that I can pass in multiple ns's

(mk-session ['my.core 'my.somethingelse] :cache false) 

You can just pass the namespaces as args I.e

(mk-session 'my.core 'my.somethingelse :cache false) 

Oh, sorry, it's & args

You're right, sorry for the stupid question

No worries 😀