FA-26918 / HTTP ranges / Member archive
A packed-object origin maps logical byte requests to immutable backing objects: zero-length map entries do not dereference backing handles · case 03
A packed-object origin maps logical byte requests to immutable backing objects: zero-length map entries do not dereference backing handles.
Case contract
x has pack strings keyed by handle, extent rows [logical-start,handle,physical-start,count], and explicit requested logical offsets. Extents may arrive unordered. Empty extents ignored. Reject negative mapping coordinates, missing handles, out-of-pack spans, or overlapping logical ownership. Return requested characters in request order, retaining repeated requested offsets; unavailable requested offsets yield None. This is a bounded storage adapter underlying HTTP range delivery, not interval normalization.
Why this case matters
Range responses combine representation identity, conditional requests, framing, and partial-object state.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| empty-extent fixture 4 | null | "a" | Failed |
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