Note: @old_value field of #AtkPropertyValues will not contain a valid value. This is a field defined with the purpose of contain the previous value of the property, but is not used anymore.
Get newValue field.
Get oldValue field.
Get propertyName field.
Set propertyName field.
Note: @old_value field of #AtkPropertyValues will not contain a valid value. This is a field defined with the purpose of contain the previous value of the property, but is not used anymore.