dst := onlyWriter{dstBuf}
	for i := 0; i < b.N; i++ {
		srcBuf.Reset()
		src.Reset(onlyReader{srcBuf})
		dstBuf.Reset()
		io.Copy(dst, src)
	}
}

func BenchmarkReaderCopyNoWriteTo(b *testing.B) {
	srcBuf := bytes.NewBuffer(make([]byte, 8192))
	srcReader := NewReader(srcBuf)
	src := onlyReader{srcReader}
	dstBuf := new(bytes.Buffer)
	dst := onlyWriter{dstBuf}