Function reviver

tools/lint-readme-lists.mjs:87–90

(_, value)

if (argv[2] && argv[2] !== '{}') {
  const reviver = (_, value) =>
    (typeof value === 'string' && value[0] === '[' && value.at(-1) === ']' ?
      new Set(JSON.parse(value)) :
      value);
  assert.deepStrictEqual(JSON.parse(argv[2], reviver), { ...actualMembers });
} else {
  console.warn('Skipping the check of GitHub teams membership.');