Interface IVTable

crates/csharp/src/AsyncSupport.cs:338–344

Common to all VTables.

/// Common to all VTables.
/// </summary>
public interface IVTable
{
    uint CancelRead(int handle);
    uint CancelWrite(int handle);
    uint Size { get; set; }
    uint Align { get; set; }
}

public struct FutureVTable : IVTable
{