1 files changed, 12 insertions, 2 deletions
diff --git a/activesupport/lib/active_support/duration.rb b/activesupport/lib/active_support/duration.rb
index 1a6c02a39b..e861a17426 100644
--- a/activesupport/lib/active_support/duration.rb
+++ b/activesupport/lib/active_support/duration.rb
@@ -7,7 +7,7 @@ module ActiveSupport
   # Time#advance, respectively. It mainly supports the methods on Numeric.
   #
   #   1.month.ago       # equivalent to Time.now.advance(months: -1)
-  class Duration < ProxyObject
+  class Duration
     attr_accessor :value, :parts
 
     def initialize(value, parts) #:nodoc:
@@ -53,8 +53,14 @@ module ActiveSupport
       end
     end
 
+    def to_s
+      @value.to_s
+    end
+
+    # Returns +true+ if +other+ is also a Duration instance, which has the
+    # same parts as this one.
     def eql?(other)
-      other.is_a?(Duration) && self == other
+      Duration === other && other.value.eql?(value)
     end
 
     def self.===(other) #:nodoc:
@@ -89,6 +95,10 @@ module ActiveSupport
       to_i
     end
 
+    def respond_to_missing?(method, include_private=false) #:nodoc
+      @value.respond_to?(method, include_private)
+    end
+
     protected
 
       def sum(sign, time = ::Time.current) #:nodoc: