I need to use different midpoint rounding rules than the default "round to even" `Mathf.Round()` has. `Mathf.Round()` doesn't have parameter for midpoint rounding, so I'm using `System.Math.Round()`.

C# has different strategies for midpoint rounding, specified here: <https://learn.microsoft.com/en-us/dotnet/api/system.midpointrounding?view=net-6.0> . `MidpointRounding.AwayFromZero` and (obviously) `MidpointRounding.ToEven` work in Unity, but others, namely `MidpointRounding.ToZero` don't work, for some reason (*"CS0117: 'MidpointRounding' does not contain a definition for 'ToZero'"*).

```
float firstN = ...
float lastN = ...
int begin = (int)Math.Round(firstN, MidpointRounding.AwayFromZero); //works
int end = (int)Math.Round(lastN, MidpointRounding.ToZero);          //doesn't work

```

I absolutely need to use `MidpointRounding.ToZero`, there really isn't any alternatives. I would have to rewrite big parts of the code again. Writing my own rounding function just to solve this one problem doesn't sound fun either.