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A sign in a hex pair is no longer accepted; only the 310 groups holding the 98-byte header are decoded and rewritten, in place and without cloning the payload; the corner lookup is one allocation-free pass; the io ole_frame test module is not built for wasm like its DWG siblings; Unknown::is_ole_frame replaces five copies of the type check. Tests: a_plus_sign_in_ole_data_is_not_hex, a_large_ole_payload_only_rewrites_its_leading_groups.