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I noticed that the 'hash' serialization type wasn't in the `known_type()` set, although it was supported otherwise. This PR adds it to the `known_type()` and also exports the type `gmser_api_encoder:known_type()`. Also, some more tests are added to try to detect this sort of thing in the future. Co-authored-by: Ulf Wiger <ulf@wiger.net> Reviewed-on: #56