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    "UI, share URLs, REST, and validation cases all call this same engine."
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    "Division by zero in operate → DIVISION_BY_ZERO"
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    "Empty or unparsable input rejected (MISSING_REQUIRED_INPUT / INVALID_NUMBER)",
    "Inputs outside the IEEE-754 binary64 range rejected (RESULT_OVERFLOW / RESULT_UNDERFLOW)",
    "Zero is returned as 0, not A × 10ⁿ with 1 ≤ |A| < 10"
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    {
      "title": "OpenStax Elementary Algebra 2e — Scientific Notation",
      "section": "5.2 An application of exponents: scientific notation",
      "url": "https://openstax.org/books/elementary-algebra-2e/pages/5-2-an-application-of-exponents-scientific-notation",
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      "title": "BIPM SI Brochure (9th edition)",
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      "supports": "Engineering notation uses exponents that are multiples of 3 so values line up with SI prefixes",
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    {
      "title": "NIST SI prefixes",
      "section": "SI prefixes from 10⁻³⁰ to 10³⁰",
      "url": "https://www.nist.gov/pml/owm/metric-si-prefixes",
      "supports": "Prefix names (milli, micro, kilo, mega, …) attached to engineering exponents",
      "kind": "standard",
      "accessed": "2026-08-30"
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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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