Example `IsApproximatelyEqual` has a bug when using negative numbers

[robin-moss]

The example code for IsApproximatelyEqual in single fails when you pass it negative numbers.

For example:

IsApproximatelyEqual(-10, -0.1)

returns True

This seems to be caused by the divisor being negative:

double divisor = Math.Max(value1.Value, value2.Value);
if (divisor.Equals(0))
{
    divisor = Math.Min(value1.Value, value2.Value);
}

return Math.Abs(value1.Value - value2.Value) / divisor <= epsilon;

Given two negative numbers the divisor is negative and so always <= epsilon. Testing locally a fix is to Math.Abs(divisor) or change the return line to:

return Math.Abs((value1.Value - value2.Value) / divisor) <= epsilon;