Trivial optimization for Enumerable#each_with_object

activesupport/lib/active_support/core_ext/enumerable.rb

@@ -76,10 +76,10 @@ def sum(identity = 0, &block)
   #
   #   (1..5).each_with_object(1) { |value, memo| memo *= value } # => 1
   #
-  def each_with_object(memo, &block)
+  def each_with_object(memo)
     return to_enum :each_with_object, memo unless block_given?
     each do |element|
-      block.call(element, memo)
+      yield element, memo
     end
     memo
   end unless [].respond_to?(:each_with_object)