Implementing StatusCheckRollup using the REST API

[iainlane]

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I've been trying to implement an equivalent of GitHub's ✔️/❌ commit summary in code using the REST API. But it's proving quite tricky to get right due to all of the corner cases: things like differences between statuses and checks, exactly which check runs to consider and when, how to decide if we're "pending" or not.

The GraphQL API has a field called StatusCheckRollup. As far as I can tell this is what's powering that indicator. I'm wondering if it would be possible to do one or both of the following:

1. Implement the same method on the REST API.
2. Document how the StatusCheckRollup algorithm works: which checks/statuses with which fields are included and when.

Which would really be super helpful. Thanks!