public static async Task ReadWriteAsync(int threshold)
        {
            using var writer = new FileBufferingWriter(memoryThreshold: threshold, asyncIO: true);
            var bytes = new byte[500];

            for (byte i = 0; i < byte.MaxValue; i++)
            {
                bytes[i] = i;
            }

            await writer.WriteAsync(bytes, 0, byte.MaxValue);

            await writer.WriteAsync(bytes.AsMemory(byte.MaxValue));

            Equal(bytes.Length, writer.Length);
            using var manager = await writer.GetWrittenContentAsync();

            Equal(bytes, manager.Memory.ToArray());
        }
        public static async Task CompatWithReadOnlySequenceAsync(int threshold)
        {
            await using var writer = new FileBufferingWriter(memoryThreshold: threshold, asyncIO: true);
            var bytes = new byte[500];

            for (byte i = 0; i < byte.MaxValue; i++)
            {
                bytes[i] = i;
            }

            await writer.WriteAsync(bytes, 0, 450);

            await writer.WriteAsync(bytes.AsMemory(450));

            Equal(bytes.Length, writer.Length);
            using var source = await writer.GetWrittenContentAsync(10);

            Equal(bytes, source.Sequence.ToArray());
        }