Follow-up from "GraphQL: Remove n+1 queries for issuable participants"

The following discussions from !98116 (merged) should be addressed:

• @cablett started a discussion:

  How would we know if these were out of sync? Should we leave a comment saying such, or have a spec that would break if they were not equal?

• @cablett started a discussion:

  As above - should we have some kind of failsafe to ensure these all stay consistent?