Is there any way to know if the object has changed?

I would want to use the library to save the settings of my program, the user can modify this settings, but I don't think user change the configuration all the time, so I would want to know if there is a way to know if the object has changed in order to save work and don't have to save the whole object every time.

A new field, the value of a field has changed, things like that.

The diff function should do this job.