RadioButtonGroup.SelectedValue intended usage

[Cfun1]

Since I think RadioButtonGroup.SelectedValue is not documented yet, if in this xaml

Xamarin.Forms/Xamarin.Forms.Controls/GalleryPages/RadioButtonGalleries/RadioButtonGroupBindingGallery.xaml

Line 12 in 2a97a6c

RadioButtonGroup.SelectedValue="{Binding Selection}">

I will hard-code RadioButtonGroup.SelectedValue="A" instead, is it supposed to check the correspondent RadioButton value or not? because actually it is not. is it the fact that Selection is declared as an object and not a string?

Xamarin.Forms/Xamarin.Forms.Controls/GalleryPages/RadioButtonGalleries/RadioButtonGroupBindingGallery.xaml.cs

Line 46 in 2a97a6c

public object Selection

tried to investigate by declaring it as an object <x:Object.. without success.

In other words, we can set which RadioButton of the group is initially checked:

<Grid>
...
                <RadioButton Content="Option A" Value="A" Grid.Row="2" IsChecked="True"/>
                <RadioButton Content="Option B" Value="B" Grid.Row="2" Grid.Column="1"/>
                <RadioButton Content="Option C" Value="C" Grid.Row="3"/>

Or

<Grid RadioButtonGroup.GroupName="{Binding GroupName}" 
                         RadioButtonGroup.SelectedValue="A">
...
                <RadioButton Content="Option A" Value="A" Grid.Row="2" IsChecked="True"/>
                <RadioButton Content="Option B" Value="B" Grid.Row="2" Grid.Column="1"/>
                <RadioButton Content="Option C" Value="C" Grid.Row="3"/>