Drop flat structs for complex union types. - #376
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I focused mostly in the DESIGN.md and generated output, but changes LGTM
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The design and generation logic look good to me!
Drop the flat struct pattern for representing tagged unions with multiple value
types, and instead use interfaces with variant types.
Note that we also fix pre-existing bugs related to marshalling and
unmarshalling interface wrapper types. We now correctly serialize nil
interfaces to `null`, rather than `{"type": ""}`, and correspondingly unmarshal
null oneOf fields to `nil`.
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Earlier, we switched from
anyto interfaces with variant structs to represent tagged unions with a single value field. We left tagged unions with multiple value fields as flat structs at the time. This patch finishes the migration to interfaces for all tagged unions.Downstream PRs: