Ah, that could be a thing. Right now I'm on 1.8.51, I'll see if upping it helps once I've gotten my breakfast eaten.

@darwin You were absolutely correct! Now my question is: Are all keys which noone cares about simply ignored without error?

@rovanion AFAIK, yes. You might consider using Figwheel, which does pretty intensive checks of project config validity.

Yeah, I am using figwheel but I'm afraid it didn't help.

ah, actually you are right, it does not check based on different ClojureScript versions