Persistence
Persistence is where you can save the values of properties of your module so that a user can have persistent data. An example use-case of this is the Counter module.
To enable persistence you define the [ModulePersistent(string serialisedName)] on any property. This takes in a serialised name to allow you to rename the property without it affecting the serialisation. Persistent properties can be public or private, but must have { get; set; } to function correctly.
Persistence loads before OnModuleStart and saves after OnModuleStop to let you finalise the data if needed.
The property instance is changed when written to, meaning any references will be out of date by the time OnModuleStart is called. Ensure you only take references in or after your module has started.