/// <summary>
/// Print a nullable number to a string with the proper number of significant digits (not just
/// number of digits after the decimal). In other words, `2345` printed to 3 significant digits
/// will print as `2350`.
/// </summary>
/// <param name="value">The number to format.</param>
/// <param name="numDigits">The number of significant digits to print.</param>
/// <returns></returns>
/// <exception cref="ArgumentOutOfRangeException">When numDigits is less than 1.</exception>
public static string SigFig(this Vector4?value, int numDigits)
{
return(value?.SigFig(numDigits));
}