[web-devel] What does Persist's PersistUpdate datatype do?

[Ian Duncan]

I'm fiddling around a bit with the Persist library and wondering what the PersistUpdate datatype does. From what I can gather, it looks like Update replaces the value, add will add to the current value if it is an integer or double, and subtract, multiply, and divide perform their respective operations. Is this correct, or is there something else to these types?

Thanks!
Ian Duncan