fix(test): default is now serialized

See rails/rails@205cdd5

Author: BuonOmo

test/cases/defaults_test.rb

@@ -39,7 +39,7 @@ class DefaultNumber < ActiveRecord::Base; end
     def test_default_decimal_zero_with_large_scale
       record = DefaultNumber.new
       assert_equal 0.0, record.decimal_number
-      assert_equal "0.0000000000000000", record.decimal_number_before_type_cast
+      assert_equal 0.0, record.decimal_number_before_type_cast
     end
   end
 end