fix(round): Throw an exception when precision is not an integer

[westofsky]

Description

When rounding, the type of the second parameter, precision, is Number, which can also accept float values. Therefore, I added exception handling for cases where it is not an Integer.

Changes

When attempting to use the round function with inputs like round(1.2345, 3.1), the result was 1.2343860767615331, which does not behave as desired for a rounding function. To fix this, I added exception handling with the following code.

if (!Number.isInteger(precision)) {
  throw new Error('Precision must be an integer.');
}

This ensures that the precision parameter must be an integer, preventing incorrect rounding behavior.

[vercel]

@westofsky is attempting to deploy a commit to the Toss Team on Vercel.

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[raon0211]

Thanks!