readline: processing \u2028 and \u2029

Not sure if we should fix, document, or ignore this and if it has been discussed, so to be on the safe side.

Currently, \u2028 and \u2029 are considered as line breaks by JavaScript RegExps, while they are ignored by the readline:

'use strict';

const fs = require('fs');
const readline = require('readline');

const str = '123\n456\r123\u{2028}456\u{2029}789';

console.log(str.split(/^/mu));

fs.writeFileSync('readline-test.txt', str, 'utf8');

const rl = readline.createInterface({
  input: fs.createReadStream('readline-test.txt', 'utf8'),
  crlfDelay: Infinity,
});

rl.on('line', console.log);

Feel free to close if this is a wontfix.

Start by running the supplied fs/readline.createInterface reproduction and compare its handling of \u2028 and \u2029 with JavaScript RegExp line breaks. Review the readline behavior and discussion to decide whether this is a bug, documentation issue, or intentional behavior; done means that decision is recorded and any agreed behavior is covered by a regression test.