You may be hitting CLJS-907 (cf CLJS-917), fixed in 0.0-2629 and later.

On Tuesday, February 3, 2015 at 8:05:04 PM UTC-6, Chris Zheng wrote:
> I'm trying to figure out how to best deal with an issue on the newer versions 
> of the class compiler:
> 
> https://github.com/purnam/purnam/issues/8
> 
> I've reproduced the issue causing the warning in this particular piece of code
> 
> (ns compiler.issue-1
>   (:require [purnam.test])
>   (:use-macros [purnam.core :only [? !]]))
> 
> (set! js/aa #js {})
> (def a js/aa)
> (! a.b.c 5555)
> (+ 2 (? a.b.c) 3)
> 
> 
> -----
> 
> Running the compiler with clojurescript "0.0-2411" yields a particular 
> warning:
> 
> WARNING: cljs.core/+, all arguments must be numbers, got [number #{nil 
> clj-nil}] instead. at line 9 test/cljs/compiler/issue_1.cljs
> 
> the previous versions of clojurescript do not give this warning. I'm hoping 
> to get a bit of help/advice on how to deal with this.
> 
> -----
> 
> you can get the warnings by:
> 
> git clone https://github.com/purnam/purnam.git
> cd purnam
> git checkout compilation-error
> lein cljsbuild once
> 
> -----

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