From 592415422949fd3af0685008657bffc5689ecada Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 15 Apr 2014 09:47:05 -0400
Subject: [PATCH] speed up VarSet#deep_dup a bit

---
 lib/rscons/varset.rb | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/rscons/varset.rb b/lib/rscons/varset.rb
index fce4237..b1dda2a 100644
--- a/lib/rscons/varset.rb
+++ b/lib/rscons/varset.rb
@@ -82,14 +82,15 @@ module Rscons
     # @param obj [Hash, Array] Hash or Array to deep copy.
     # @return [Hash, Array] Deep copied value.
     def deep_dup(obj)
-      if obj.is_a?(Hash)
+      obj_class = obj.class
+      if obj_class == Hash
         obj.reduce({}) do |result, (k, v)|
           result[k] = deep_dup(v)
           result
         end
-      elsif obj.is_a?(Array)
+      elsif obj_class == Array
         obj.map { |v| deep_dup(v) }
-      elsif obj.is_a?(String)
+      elsif obj_class == String
         obj.dup
       else
         obj