[form-urlencoded] Parsing objects not working as expected

[josiahwiebe]

Objects in form-urlencoded bodies are not being parsed as expected.

For example: ?test=data&object[item]=objectdata
This would be parsed as:

{
  test: data,
  'object[item]': objectdata,
}

The expected result is:

{
  test: data,
  object: {
    item: objectdata,
  }
}