only exclude serialized columns from cacheable columns

activerecord/lib/active_record/attribute_methods/read.rb

@@ -88,7 +88,11 @@ def __temp__(v, attributes, attributes_cache, attr_name)
 
         private
         def cacheable_column?(column)
-          attribute_types_cached_by_default.include?(column.type)
+          if attribute_types_cached_by_default == ATTRIBUTE_TYPES_CACHED_BY_DEFAULT
+            ! serialized_attributes.include? column.name
+          else
+            attribute_types_cached_by_default.include?(column.type)
+          end
         end
 
         def internal_attribute_access_code(attr_name, cast_code)

activerecord/test/cases/attribute_methods_test.rb

@@ -776,7 +776,7 @@ def cached_columns
   end
 
   def time_related_columns_on_topic
-    Topic.columns.select { |c| c.type.in?([:time, :date, :datetime, :timestamp]) }
+    Topic.columns.select { |c| [:time, :date, :datetime, :timestamp].include?(c.type) }
   end
 
   def in_time_zone(zone)