Function unescape

test/html5lib.spectest.js:46–49

(s)

const BATCH = 400;

const unescape = (s) =>
	s.replace(/\\u([0-9A-Fa-f]{4})/g, (_, h) =>
		String.fromCharCode(Number.parseInt(h, 16))
	);

/**
 * @returns {{ id: string, input: string }[]} every Data-state tokenizer input