Add expiration option

[maarten00]

When using simple storage to save your current form state you probably don't want to persist forever. It would be great if I could pass a prop so the stored state expires if it hasn't been updated for x minutes/seconds. On page refresh it should ignore the locally stored data, use the default state instead and clear the locally stored data.

[jordyvandomselaar]

I think what would also help is a callback that triggers before updating parent state, allowing you to mutate the data before hydrating.