RFC PR

ACTION (Benjie) - Write an implementation in GraphQL.js

• assignee(s): @benjie
• source: https://github.com/graphql/graphql-wg/blob/main/notes/2021-03-04.md#rfc-oneof-input-objects-and-oneof-fields-30m-benjie

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