Hello,

I would like to define a message wrap with some enum field that will tell 
which specific message is wrapped inside (as described in 'Techniques > 
Union Types'<https://developers.google.com/protocol-buffers/docs/techniques>
 section).
Later on I would like to extend the wrap by adding new wrapped messages, 
using extensions mechanism. However, I see no way to extend the enum.
Any ideas on this?

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