Did you run `lein clean && lein cljsbuild clean` after the upgrade? 

On Wednesday, December 24, 2014 8:12:30 AM UTC+2, [email protected] wrote:
> A recent upgrade has introduced a bunch of new warnings of these types:
> 
> 1. cljs.core/+, all arguments must be numbers, got [#{nil clj-nil} #{nil any 
> clj-nil}] instead....
> 2. WARNING: Use of undeclared Var...
> 
> I tried adding some changes to my project.clj with out much luck or 
> understanding for what is or should be possible:
> 
>  :compiler {...
>                   :warning-level :quiet}}
> 
> Which does nothing. And then:
> 
>  :compiler {...
>     :warnings {:invalid-arithmetic false}}
> 
> Which suppresses both the arithmetic and the undeclared vars warnings. 
> 
> Is there any place that provides good documentation on these clojurescript 
> compiler options? I've checked both of these: 
> https://github.com/clojure/clojurescript/wiki, 
> https://github.com/emezeske/lein-cljsbuild, however there's not much depth or 
> they are out of date.
> 
> Thanks,
> Tim

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