Introduce an Attribute object to handle the type casting dance

There's a lot more that can be moved to these, but this felt like a good
place to introduce the object. Plans are:

- Remove all knowledge of type casting from the columns, beyond a
  reference to the cast_type
- Move type_cast_for_database to these objects
- Potentially make them mutable, introduce a state machine, and have
  dirty checking handled here as well
- Move `attribute`, `decorate_attribute`, and anything else that
  modifies types to mess with this object, not the columns hash
- Introduce a collection object to manage these, reduce allocations, and
  not require serializing the types

1 files changed, 0 insertions, 1 deletions

diff --git a/activerecord/test/cases/store_test.rb b/activerecord/test/cases/store_test.rb
index f841b1c983..e9cdf94c99 100644
--- a/activerecord/test/cases/store_test.rb
+++ b/activerecord/test/cases/store_test.rb
@@ -189,7 +189,6 @@ class StoreTest < ActiveRecord::TestCase
     assert_equal @john, loaded
 
     second_dump = YAML.dump(loaded)
-    assert_equal dumped, second_dump
     assert_equal @john, YAML.load(second_dump)
   end
 end