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dayjs-jp-format's Issues

getJpYear returns 年

problem

getJpYear expects without 年 but still returns value including 年

const jpYear = getJpYear(new Date('2020-01-01"));
console.log(jpYear) // 令和3年

expected value

const jpYear = getJpYear(new Date('2020-01-01"));
console.log(jpYear) // 令和3

rrrrの際、2桁と1桁のときで表記が異なる

example

import { jpFormat } from 'dayjs-jp-format';
// load on demand
import dayjs from 'dayjs';

dayjs.extend(jpFormat); // use plugin

const main = () => {
  const heisei09 = dayjs('1997-01-0').format('rrrr');
  console.log({ heisei09 }); // -> 平成9年

  const heisei10 = dayjs('1998-01-01').format('rrrr');
  console.log({ heisei10 }); // -> 平成10 となり年なし
};
main();

Intl.DateTimeFormatから取ってきたあとのsliceがおかしい? かもしれません。
"年"を省く際は最後の一文字を削除すると良いのではないでしょうか。

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