I've stumbled upon an issues I'm not sure how to solve. In NuFi dApp connector we use InteropLib to parse incoming transactions. Then we also try to rebuild the transaction in CSL to make sure we've parsed the tx correctly.

Re-serializing an update_committee governance action doesn't work because the info about unit_interval being a tagged type is lost in the rawGovernanceAction and it's only a simple JS array. And so when we parse the transaction we get the following object:

[ 4, null, [], Map(1) { [Array] => 123 }, [ 1, 4 ] ]

The [ 1, 4 ] array should be Tagged(30, [ 1, 4 ]) and so when I'd like to reserialize the gov action via cbor.encode I basically can't. I would have to manually check and modify the array into a tagged type. I understand it's not feasible to make the parser return the Tagged type but wouldn't it be possible to return the raw cbor for Unparsed or perhaps just for govAction? That would fix the issue since I would just pass the raw bytes into CSL and the interop lib serializer could also be modified to handle this without adding all the gov actions.

This might be a problem for InteropLib as well since you can't parse a transaction and serialize it back if contains a update_committee action.

This PR should resolve the above-mentioned issue with tag 30.