hi, 
in the simple case below, it is possible to marshal out a ([`A | `B]
list), and then read it back as a [> `A | `B | `C] list.

can this behavior be counted on , or is it not something an
application can assume to always work?

thanks
henri



# Marshal.to_channel oc ([`A; `B] : [`A | `B] list) [];;
- : unit = ()

# let a = (Marshal.from_channel ic : [> `A| `B | `C] list);;
val a : [> `A | `B | `C ] list = [`A; `B]

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