coerce mirror property names to strings

ofrobots · ofrobots · commit 291ef02d74b1 · 2016-04-20T18:02:38.000-07:00
For array indices in Node 4.x+ the property mirror's names are
integers instead of strings.
diff --git a/lib/state.js b/lib/state.js
@@ -442,17 +442,18 @@ StateResolver.prototype.getMirrorProperties_ = function(mirror) {
 };
 
 StateResolver.prototype.resolveMirrorProperty_ = function(property) {
+  var name = String(property.name);
   if (property.isNative()) {
     return {
-      name: property.name(),
+      name: name,
       varTableIndex: NATIVE_PROPERTY_MESSAGE_INDEX
     };
   }
   if (property.hasGetter()) {
     return {
-      name: property.name(),
+      name: name,
       varTableIndex: GETTER_MESSAGE_INDEX
     };
   }
-  return this.resolveVariable_(property.name(), property.value());
+  return this.resolveVariable_(name, property.value());
 };
