1 files changed, 12 insertions, 8 deletions
diff --git a/activesupport/lib/active_support/core_ext/object/duplicable.rb b/activesupport/lib/active_support/core_ext/object/duplicable.rb
index 9cd7485e2e..620f7b6561 100644
--- a/activesupport/lib/active_support/core_ext/object/duplicable.rb
+++ b/activesupport/lib/active_support/core_ext/object/duplicable.rb
@@ -19,7 +19,7 @@
 class Object
   # Can you safely dup this object?
   #
-  # False for +nil+, +false+, +true+, symbol, and number objects;
+  # False for +nil+, +false+, +true+, symbol, number objects;
   # true otherwise.
   def duplicable?
     true
@@ -78,13 +78,17 @@ end
 
 require 'bigdecimal'
 class BigDecimal
-  begin
-    BigDecimal.new('4.56').dup
+  def duplicable?
+    true
+  end
+end
 
-    def duplicable?
-      true
-    end
-  rescue TypeError
-    # can't dup, so use superclass implementation
+class Method
+  # Methods are not duplicable:
+  #
+  #  method(:puts).duplicable? # => false
+  #  method(:puts).dup         # => TypeError: allocator undefined for Method
+  def duplicable?
+    false
   end
 end