dstBuf := new(bytes.Buffer)
	dst := NewWriter(dstBuf)
	for i := 0; i < b.N; i++ {
		srcBuf.Reset()
		dstBuf.Reset()
		dst.Reset(dstBuf)
		io.Copy(dst, src)
	}
}

func BenchmarkWriterCopyUnoptimal(b *testing.B) {
	srcBuf := bytes.NewBuffer(make([]byte, 8192))
	src := onlyReader{srcBuf}
	dstBuf := new(bytes.Buffer)
	dst := NewWriter(onlyWriter{dstBuf})
	for i := 0; i < b.N; i++ {