/// This is for debugger display use only: <see cref="TopLevelNullability"/> will set the <see cref="BoundNodeAttributes.WasTopLevelNullabilityChecked"/>
/// This is for debugger display use only: <see cref="TopLevelNullability"/> will set the BoundNodeAttributes.WasTopLevelNullabilityChecked
/// bit in the boundnode properties, which will break debugging. This allows the debugger to display the current value without setting the bit.