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Client attachment resource ownership: Selected id deduplication · case 05

Selected id deduplication.

Member previewVariant 5 · 3 implementations · 60 checks per implementation

Case contract

Attachment identity differs from file name and byte count. Zero-byte and same-name files remain separate. Preview URLs and selected IDs are cleaned by attachment identity; submitted files and read-only commands have separate lifetimes. Operation selected-id-deduplication has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
selected-id-deduplication scenario 6	`["a", "a"]`	`["a"]`	Failed

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