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  "assumptions": [
    "Canonical size is the Imperial SWG inch table (7/0–50). millimetre = inch × 25.4 (exact).",
    "Area uses that millimetre, not a rounded display value.",
    "Area assumes a solid circular cross-section of that diameter.",
    "For tube/sheet use-cases, interpret d as wall/sheet thickness.",
    "SWG 0 and 1/0 share the tabulated 0.324 in size used here; some catalogues list 1/0 separately."
  ],
  "limitations": [
    "Lookup table only for integer SWG 7/0 (−6) through 50",
    "Out-of-range → SWG_OUT_OF_RANGE (not 0 mm)",
    "Non-integer → SWG_NOT_INTEGER (not Math.round)",
    "Canonical diameter is inch; mm = inch × 25.4 (exact); area uses that mm",
    "SWG ≠ AWG; same number different diameter"
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    "Unparseable swg → INVALID_NUMBER",
    "Non-integer SWG → SWG_NOT_INTEGER (not Math.round)",
    "SWG outside 7/0 (−6)…50 → SWG_OUT_OF_RANGE (not 0 mm)",
    "field not mm|mm2 → INVALID_MODE",
    "Lower SWG number → thicker diameter (within table)",
    "field=mm → diameter; field=mm2 → πd²/4 from exact mm",
    "UI/share mode=swg-mm|swg-mm2 maps to field; query a aliases swg"
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    {
      "title": "British Standards Institution — BS 3737:1964",
      "section": "Guide to series of basic sizes for metal sheet, strip and wire — Status: Withdrawn. Public catalogue confirms identity/status. Exact PDF table/clause/page is not asserted. The 57-row inch dataset was independently checked 2026-09-10 against Wikipedia, Engineering Toolbox, and Trojan SF (57/57 inch identity); 0.324 in is canonical SWG 0, with 1/0 as alias.",
      "url": "https://knowledge.bsigroup.com/products/guide-to-series-of-basic-sizes-for-metal-sheet-strip-and-wire",
      "supports": "Historical definition/reference for Imperial SWG diameter series (inch). Used as historical identity, not a current BSI product standard, and not a row-by-row BSI PDF transcription.",
      "kind": "standard"
    },
    {
      "title": "NIST Guide to the SI (SP 811)",
      "section": "Millimetre as the SI unit for length; 1 in = 25.4 mm exactly",
      "url": "https://www.nist.gov/pml/special-publication-811",
      "supports": "d_mm = d_in × 25.4; diameter output in mm and area in mm²",
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