Function roundAccurately

roundAccurately(number: number | null, decimalPlaces?: number): number | null
Rounds a number to a specified number of decimal places, ensuring precision is maintained. If no decimal places are provided, the default is 0 (rounds to the nearest integer).

This function uses scientific notation to avoid floating-point precision errors commonly associated with rounding in JavaScript.
Parameters
- number: number | null
  The number to round. If the number is null or not finite (e.g., Infinity), null is returned.
- decimalPlaces: number = 0
  The number of decimal places to round to (default is 0).
Returns number | null
The rounded number, or null if the input is invalid.
Example
```
roundAccurately(123.4567, 2); // 123.46
roundAccurately(123.4567);    // 123
roundAccurately(123.4567, 0); // 123
roundAccurately(null);        // null
roundAccurately(Infinity);    // null
```