CascadingTypeParameter not passing down nullability

[danielchalmers]

I have a MudToggleGroup<System.Nullable<int>> but the children's types are the non-nullable MudToggleItem<int>.

<MudToggleGroup T="int?">
    <MudToggleItem Value="1" Text="Coffee (1)" />
    <MudToggleItem Value="2" Text="Tee (2)" />
    <MudToggleItem Value="3" Text="Water (3)" />
</MudToggleGroup>

@* MudToggleGroup.razor *@
@namespace MudBlazor
@attribute [CascadingTypeParameter(nameof(T))]
@inherits MudComponentBase
@typeparam T

@* MudToggleItem.razor *@
@namespace MudBlazor
@inherits MudComponentBase
@typeparam T

There are no other ancestors with a type param named T.

Any idea on how to pass down the nullability without manually casting them like Value="@((int?)3)"?