It's too complicated to use push like concat

so we'll just leave it the way it is.

Author: nicholas-esterer

src/plots/cartesian/axes.js

@@ -95,7 +95,7 @@ axes.coerceRef = function(containerIn, containerOut, gd, attr, dflt, extraOption
 
     if(!dflt) dflt = axlist[0] || (typeof extraOption === 'string' ? extraOption : extraOption[0]);
     if(!extraOption) extraOption = dflt;
-    if(domainRef) axlist.push(axlist.map(function(x) { return x + ' domain'; }));
+    if(domainRef) axlist = axlist.concat(axlist.map(function(x) { return x + ' domain'; }));
 
     // data-ref annotations are not supported in gl2d yet