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SPPersistedUpgradableObject is a SPPersistedObject that implements the IUpgradable interface. The MSDN is seriously lacks any documentation other than it:

Provides members for managing an upgradable object

It seems to be related to caching and reloading the object from the database but i can't find confirmation of this anywhere.

So really my question do:

SPWebapplication wa = SPContext.Current.Web.Site.WebApplication;
wa.Invalidate() //causes object to be reloaded from database on next access?

and

wa.Upgrade(); //causes object to be reloaded from the database?

actually do what i think they are doing?

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