public static async Task DecodeAsAllocatedBuffer()
        {
            using var dto = new MemoryTransferObject(sizeof(long));
            Span.AsReadOnlyBytes(42L).CopyTo(dto.Content.Span);
            using var memory = await dto.ToMemoryAsync();

            Equal(42L, BitConverter.ToInt64(memory.Memory.Span));
        }
        public static async Task BufferedDTO()
        {
            using var dto = new MemoryTransferObject(sizeof(long));
            Span.AsReadOnlyBytes(42L).CopyTo(dto.Content.Span);
            Equal(sizeof(long), dto.As <IDataTransferObject>().Length);
            True(dto.As <IDataTransferObject>().IsReusable);
            var writer = new ArrayBufferWriter <byte>();
            await dto.WriteToAsync(writer);

            Equal(sizeof(long), writer.WrittenCount);
            Equal(42L, BitConverter.ToInt64(writer.WrittenSpan));
            var memory = await dto.ToByteArrayAsync();

            Equal(42L, BitConverter.ToInt64(memory, 0));
        }