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serialization of external pointers

Hello,

I'm looking for examples of how to handle serialization of external 
pointers.

We use external pointers intensively in Rcpp for modules and one popular 
request is to have persistence. And I guess we need to be able to 
serialize/deserialize external pointers for this.

Also, module objects are all instances of reference classes, so maybe 
that can be handled at the R level ?

Romain