Merge pull request rails#52726 from ruyrocha/fix/tz-conversion-equality-method

[rails#52699] Update `TimeZoneConverter#==` method to make it symmetric

Author: rafaelfranca

activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb

@@ -33,10 +33,7 @@ def cast(value)
         end
 
         def ==(other)
-          precision == other.precision &&
-            scale == other.scale &&
-            limit == other.limit &&
-            type == other.type
+          other.is_a?(self.class) && __getobj__ == other.__getobj__
         end
 
         private

activerecord/test/cases/attribute_methods/time_zone_converter_test.rb

@@ -13,6 +13,7 @@ def test_comparison_with_date_time_type
           value_from_cache = Marshal.load(Marshal.dump(value))
 
           assert_equal value, value_from_cache
+          assert_not_equal value, "foo"
         end
       end
     end