Function exactFloat

javascript/packages/core/lib/compatible/scalar.ts:468–495

(value: DecimalParts, localTypeId: number)

}

function exactFloat(value: DecimalParts, localTypeId: number): number {
  let candidate = partsToNumber(value);
  if (!Number.isFinite(candidate)) {
    throw new Error(
      "Scalar value is not exactly representable as a finite float.",
    );
  }
  switch (canonicalScalarTypeId(localTypeId)) {
    case TypeId.FLOAT16:
      candidate = fromFloat16Bits(toFloat16Bits(candidate));
      break;
    case TypeId.BFLOAT16:
      candidate = fromBFloat16Bits(toBFloat16Bits(candidate));
      break;
    case TypeId.FLOAT32:
      float32Array[0] = candidate;
      candidate = float32Array[0];
      break;
    default:
      break;
  }
  if (!partsEqual(value, floatToParts(candidate))) {
    throw new Error(
      "Scalar value is not exactly representable by the target float type.",
    );
  }
  return candidate;
}

function rangeCheckedInteger(
  value: number | bigint,