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    "Missing/invalid numbers → INVALID_NUMBER / MISSING_REQUIRED_INPUT",
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      "title": "BIPM SI Brochure (9th edition)",
      "section": "Table 8 — SI prefixes (powers of 10³)",
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      "kind": "standard",
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      "supports": "Decimal scientific notation as a coefficient times a power of ten, normalization, and the distinction from binary floating-point representation. CalculatorX states its sign, zero and exponent policies separately. Mathematical representation reference only; not implementation validation or endorsement.",
      "kind": "reference",
      "publisher": "UC Berkeley CS61C course staff"
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    "Normalize via Number#toExponential; engineering exponent ≡ 0 (mod 3)",
    "Test suites are not interchangeable: 20 published examples on this page · 124 automated engine checks (IUT) · CVP verification suite on Evidence (Manifest is the verification source of truth)"
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