Allow recursion within ResolveAbstractType

At a glance

• Identifier: #960
• Stage: RFC0: Strawman
• Champion: @yaacovCR
• PR: Allow recursion within ResolveAbstractType

Timeline

• Added to 2022-07-07 WG agenda
• Mentioned in 2022-07-07 WG notes
• Spec PR created on 2022-06-10 by yaacovCR
• 2 commits pushed on 2022-06-10:
  • Allow recursion within ResolveAbstractType by @yaacovCR
  • Update spec/Section 6 -- Execution.md by @yaacovCR

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This formalizes the proprosed feature within graphql-js whereby the internal method provided by JavaScript for runtime type resolution is allowed to return an intermediate interface.

See: Issue: https://github.com/graphql/graphql-js/issues/3253 PR: https://github.com/graphql/graphql-js/pull/3599

@IvanGoncharov suggested that this would require​ a spec change. Alternatively, perhaps the recursion should be considered to be a feature of the internal system itself, possibly limited to JavaScript-like implementations.

This PR provides some potential spec text, were a spec change to be considered necessary.