Created by: eriktim
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Using oneOfs with typescript-fetch results in union types, but lacks decoders and encoders for them. This PR patches that. I've also added support for the discriminator (resulting in tagged unions).
@wing328 Is there already a YAML available for testing oneOfs/allOfs/discriminators? Otherwise I would like to add a generic one.
cc @TiFu @taxpon @sebastianhaas @kenisteward @Vrolijkx @macjohnny @nicokoenig @topce @akehir