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Looks ok, but could you please update the docs accordingly as well?

Getting (optional) boolean support when decoding would be nice from a feature and symmetry perspective, but that's not a requirement imo.

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In order to backport Val.pmod to 7.8.526, I had to remove Null, because

it

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references Builtin.Null, which doesn't exist.

Right. That shouldn't be a problem in this case.

That last patch was for 7.8.526 with Val.pmod backported (meaning, minus Val.Null) to add boolean support to Protocols.XMLRPC using Val.