internal/bufio/bufio.go
func NewWriter(w io.Writer) *Writer {
	return &Writer{
		wr: bufio.NewWriter(w),
		b:  make([]byte, writerBufferSize),
		tr: unicode.Utf8ToCesu8Transformer,
	}
}
func NewWriter(w io.Writer) *Writer {
	return &Writer{
		wr: bufio.NewWriter(w),
		b:  make([]byte, writerBufferSize),
		tr: unicode.Utf8ToCesu8Transformer,
	}
}
// NewWriter creates a new Writer instance.