fix counting in pagination when Integer has length method (Ruby Facets)

lib/will_paginate/finder.rb

@@ -235,7 +235,7 @@ def wp_count(options, args, finder)
                   counter.call
                 end
 
-        count.respond_to?(:length) ? count.length : count
+        (!count.is_a?(Integer) && count.respond_to?(:length)) ? count.length : count
       end
 
       def wp_parse_options(options) #:nodoc:

test/finder_test.rb

@@ -39,6 +39,22 @@ def test_parameter_api
     assert_nothing_raised { Topic.paginate :page => 1, :count => nil }
   end
 
+  def test_counting_when_integer_has_length_method
+    Integer.module_eval { def length; to_s.length; end }
+    begin
+      assert_equal 2, 11.length
+      entries = Developer.paginate :page => 1, :per_page => 5
+      assert_equal 11, entries.total_entries
+      assert_equal 5, entries.size
+      assert_equal 3, entries.total_pages
+    ensure
+      begin
+        Integer.module_eval { remove_method :length }
+      rescue
+      end
+    end
+  end
+
   def test_paginate_with_per_page
     entries = Topic.paginate :page => 1, :per_page => 1
     assert_equal 1, entries.size