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skylar taylor-barrick
00d5fa5cdd
Reject a non-null Prev entry that cannot be read as an offset instead of silently treating it as the end of the guarded trailer chain. Keep absent/null end markers and readable numeric offsets unchanged. Reproduced CodeRabbit discussion_r4366245854 with an independent probe and a failing native regression before the fix. The synthetic regression covers seven unreadable value types plus absent/null and integer/real history controls. Validation: all 9 cargo xtask ci gates passed (3063 tests passed, 6 skipped; 16 WASM-safe crates). One unrelated GPU test was labelled leaky by nextest in that run and passed cleanly in an isolated rerun. Independent checks: 17 original supported PDF variants still pass qpdf, logical preservation and Poppler pixels; 6 original refusal cases remain refused. All 11 additional Prev controls pass (7 refused, 4 accepted).