Hi

Suppose I use Marshall module (and input_value / output_value pervasives) to 
serialize a sophisticated data type. If I make [small] changes to this data 
type, what is the best way to convert old saved data?

What if the new type is a supertype to the old one, can I load it safely?

I tried it with 

type old_type = Float of float | Int of int ;;
type new_type = Float of float | Int of int | S of string;;

and it seemed to have worked with input_value and output_value.


Thanks
Oleg
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