commit 092ce58aa8713f387ae3d0467b6d8029cf2765cd
Author: Jonathan <chapmajs@gmail.com>
Date:   Sun Oct 19 22:05:26 2014 -0400

    Allowing calls to private_methods

diff --git a/lib/celluloid/proxies/abstract_proxy.rb b/lib/celluloid/proxies/abstract_proxy.rb
index 6a79acb..2db7a8e 100644
--- a/lib/celluloid/proxies/abstract_proxy.rb
+++ b/lib/celluloid/proxies/abstract_proxy.rb
@@ -5,7 +5,7 @@ module Celluloid
     def __class__; AbstractProxy; end
 
     # Needed for storing proxies in data structures
-    needed = [:object_id, :__id__, :hash] - instance_methods
+    needed = [:object_id, :__id__, :hash, :private_methods] - instance_methods
     if needed.any?
       include ::Kernel.dup.module_eval {
         undef_method(*(instance_methods - needed))