Make Enumerable#many? not rely on #size

activesupport/lib/active_support/core_ext/enumerable.rb

@@ -93,10 +93,10 @@ module Enumerable
     Hash[map { |elem| [yield(elem), elem] }]
   end
 
-  # Returns true if the collection has more than 1 element. Functionally equivalent to collection.size > 1.
+  # Returns true if the enumerable has more than 1 element. Functionally equivalent to enum.to_a.size > 1.
   # Can be called with a block too, much like any?, so people.many? { |p| p.age > 26 } returns true if more than 1 person is over 26.
   def many?(&block)
-    size = block_given? ? count(&block) : self.size
+    size = block_given? ? count(&block) : to_a.size
     size > 1
   end
 

activesupport/test/core_ext/enumerable_test.rb

@@ -89,7 +89,7 @@ class EnumerableTests < Test::Unit::TestCase
 
   def test_index_by
     payments = GenericEnumerable.new([ Payment.new(5), Payment.new(15), Payment.new(10) ])
-    assert_equal({ 5 => payments[0], 15 => payments[1], 10 => payments[2] },
+    assert_equal({ 5 => Payment.new(5), 15 => Payment.new(15), 10 => Payment.new(10) },
                  payments.index_by { |p| p.price })
   end