FA-26953 / HTTP ranges / Member archive

Partial cache admission publishes complete requested fragments atomically: unexpected origin bytes do not count as admitted requested cells · case 03

Partial cache admission publishes complete requested fragments atomically: unexpected origin bytes do not count as admitted requested cells.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

x is [old-visible-cells,events]. Events begin(id,expected-offsets), put(id,offset,char), commit(id), abort(id), read. One transaction at a time; unknown or mismatching ids ignored. A conflicting duplicate byte invalidates the active transaction. Commit succeeds only when every expected cell is present and replaces the old generation. Readers see committed cells sorted by offset. Return [read-snapshots,final-cells,pending-id].

Why this case matters

Range responses combine representation identity, conditional requests, framing, and partial-object state.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
requested-membership fixture 3	`[[], [], "a"]`	`[[], [[0, "a"]], null]`	Failed

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