$transform with array cast

[vkarpov15]

const NameType = new Archetype({
  first: { $type: 'string' },
  last: { $type: 'string' }
}).compile('NameType');

const Params = new Archetype({
  names: { 
    $type: [{ $type: NameType, $transform: JSON.parse }],
    $default: []
  }
}).compile('Params');

app.get('/', function(req, res) {
  const { names } = new Params(req.query);
  res.json(names.map(n => `${n.first} ${n.last}`).join(','));
});

run().catch(error => console.error(error));

async function run() {
  await app.listen(3000);

  const root = 'http://localhost:3000';
  const names = [
    { first: 'James', last: 'Kirk' },
    { first: 'Leonard', last: 'McCoy' }
  ];
  console.log(await superagent.get(`${root}`).then(res => res.text));
  console.log(await superagent.get(`${root}?names=${JSON.stringify(names[0])}`).then(res => res.text));
  let url = `${root}?names=${JSON.stringify(names[0])}&names=${JSON.stringify(names[1])}`;
  console.log(await superagent.get(url).then(res => res.text));
}