FA-76247 / Chat ordering and read receipts / Member archive

Summarize a thread root's replies: overflow count · case 02

Threads with fewer than three participants report a negative "+N more".

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

messages {seq, root, author, deleted}; replies of a thread have root equal to the root seq (the root itself has root None). Deleted replies are ignored. Result {count, faces: first three distinct reply authors in order of their first reply, more: number of further distinct authors, last: seq of the newest reply or None}.

Why this case matters

Thread summaries sit under the root message and drive navigation into the thread.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
root is not a reply	`{"count": 1, "faces": ["bo"], "last": 6, "more": -2}`	`{"count": 1, "faces": ["bo"], "last": 6, "more": 0}`	Failed

MEMBER ARCHIVE

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