What changed
Producer-side tools call this non-breaking. For a consumer it is a null dereference on an unknown future date.
Affects payload.author on UserEvent reachable from 1 operation. Nothing fails at the call; it fails wherever the value is finally used, which is usually somewhere else entirely.
no longer guaranteed present
Who is affected
Code that reads Vercel's UserEvent objects, used by 1 Vercel operation.
Before and after
| Where | Before | After |
|---|---|---|
| UserEvent.payload.author | always present | may be missing |
Code that breaks
// response.payload.author may now be absent or null const author = response.payload.author ?? fallback;
Based on Vercel’s published API specification. How severity is decided.