Jwt-auth: auth()->attempt() returns boolean on Laravel 6

[begimov]

Subject of the issue

$token = auth()->attempt($request->only(['email', 'password']));
Returns true on Laravel 6, and not token.

Your environment

| Q | A
| ----------------- | ---
| Bug? | yes
| New Feature? | no
| Framework | Laravel
| Framework version | 6.0.0
| Package version | 1.0.0-rc.5
| PHP version | 7.2.4

Steps to reproduce

$token = auth()->attempt($request->only(['email', 'password']));
Previously returned actual token on Laravel 5.8

Expected behavior

$token = auth()->attempt($request->only(['email', 'password']));
Should return token if attempt is successfull.

Actual behavior

$token = auth()->attempt($request->only(['email', 'password']));
Returns true on Laravel 6.

[JohanSchobben]

For people having the same problem use:
$token = auth('api')->attempt($request->only(['email', 'password']))
instead of:
$token = auth()->attempt($request->only(['email', 'password']));

[FallenNoir]

`
/**

• Attempt to authenticate a user using the given credentials.
  *
• @param array $credentials
• @param bool $remember
• @return bool
  */
  public function attempt(array $credentials = [], $remember = false);
  `
  How does changing the guard make it return something different to the bool field?