sealed.label_keys turns on sealed.label_join: a published JSON, JSONL, CSV, TSV or Markdown-table record that holds a label field and an identifier (an identifier_keys glob or a hex value) is refused when its fingerprint is new against every parent. Unreadable supported files are sealed.label_join_unchecked. Without label_keys the guard reads no blobs and its output matches main byte for byte (golden in test/fixtures/sealed-guard-off-golden.json).
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>