make `includeDeprecated` non nullable

At a glance

• Identifier: #1142
• Stage: RFC1: Proposal
• Champion: @martinbonnin
• PR: make `includeDeprecated` non nullable
• Related:
  • #1040 (Make the reason argument in `@deprecated` non-nullable)

Timeline

• Added to 2025-04-03 WG agenda
• Added to 2025-03-06 WG agenda
• Spec PR created on 2025-03-04 by martinbonnin
• Commit pushed: make `includeDeprecated` non nullable on 2025-03-04 by @martinbonnin

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• graphql-js PR: https://github.com/graphql/graphql-js/pull/4354

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In the same spirit as https://github.com/graphql/graphql-spec/pull/1040, make includeDeprecated non-nullable in the introspection schema.

I don't think there is ever a reason to passe includeDeprecated: null?