static create(
    writer,
    size = DEFAULT_BUF_SIZE,
  ) {
    return writer instanceof BufWriter ? writer : new BufWriter(writer, size);
  }
/** return new BufWriter unless writer is BufWriter */
return new BufWriter unless writer is BufWriter
return new BufWriter unless writer is BufWriter
static create(
    writer,
    size = DEFAULT_BUF_SIZE,
  ) {
    return writer instanceof BufWriter ? writer : new BufWriter(writer, size);
  }
static create ( writer , size = DEFAULT_BUF_SIZE , ) { return writer instanceof BufWriter ? writer : new BufWriter ( writer , size ) ; }
return new BufWriter unless writer is BufWriter
return new BufWriter unless writer is BufWriter