Function asBignum

src/compute-engine/boxed-expression/numerics.ts:117–129

(expr: Expression | undefined)

  return bigintValue(x as MathJsonExpression);
}

export function asBignum(expr: Expression | undefined): BigDecimal | null {
  if (expr === undefined || expr === null) return null;
  if (!isNumber(expr)) return null;
  const num = typeof expr === 'number' ? expr : expr.numericValue;

  if (typeof num === 'number') return expr.engine.bignum(num);

  if (num.im !== 0) return null;

  const re = num.bignumRe ?? num.re;
  if (typeof re === 'number' && isNaN(re)) return null;
  return expr.engine.bignum(re);
}

/**