Response from POST does not match documentation: userId is string instead of integer

[BrennanAyers]

Steps to reproduce:

fetch('https://jsonplaceholder.typicode.com/posts', {
    method: 'POST',
    body: JSON.stringify({
      title: 'foo',
      body: 'bar',
      userId: 1
    }),
    headers: {
      "Content-type": "application/json; charset=UTF-8"
    }
  })
  .then(response => response.json())
  .then(json => console.log(json))

Expected response:

{
  id: 101,
  title: 'foo',
  body: 'bar',
  userId: 1
}

Actual response:

{
  id: 101,
  title: 'foo',
  body: 'bar',
  userId: '1'
}

---

I'm not sure which one is correct, but it did make writing tests against it a little confusing 😄

Thanks for maintaining the project, and I'm glad I could help in some way!