The example was helpful.   Encapsulating the Persistent in the callacks 
private data object seems to be the way to roll.
 

> // kParameter will pass a void* parameter back to the callback, 
> kInternalFields
> // will pass the first two internal fields back to the callback, kFinalizer
> // will pass a void* parameter back, but is invoked before the object is
> // actually collected, so it can be resurrected. In the last case, it is 
> not
> // possible to request a second pass callback.
> enum class WeakCallbackType { kParameter, kInternalFields, kFinalizer };


Does that help?

Sorry, but no not really.  
Resurrection?  Sounds like a zombie movie (I probably don't need this)
*kInternalFields - will pass the first two internal fields back to the 
callback*
How? Why?

There has to be something better that explains the callbacks better.

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