Getting InvalidDocblock when using the non-negative-int scalar type on a class with namespace

[eopnetto]

I'm trying to validate that the index of an array is a non-negative integer, which works fine in the example below:
https://psalm.dev/r/9113171040

However, I'm getting an InvalidDocblock error when using non-negative-int on a class with a namespace:
https://psalm.dev/r/21478194fc

namespace App;

class Entity {
    /**
    * @psalm-var array<non-negative-int, string>
    */
    private $actions = [];
    
    public function __construct() {
        $this->actions[-1]= 'test'; // I would expect an `InvalidPropertyAssignmentValue` error here, but I get an `InvalidDocblock` instead
    }
}

Note: it works if add a backslash before: \non-negative-int
https://psalm.dev/r/33769b88c8

I'm assuming this is a bug, right?! Or is it the expected behavior?

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/9113171040

<?php

class Entity {

    /**
    * @psalm-var array<non-negative-int, string>
	*/
    private $actions = [];
    
    public function __construct() {
        $this->actions[-1]= 'test';
    }
}

Psalm output (using commit 8329309):

ERROR: InvalidPropertyAssignmentValue - 11:9 - $this->actions with declared type 'array<int<0, max>, string>' cannot be assigned type 'array{-1: 'test', ...<int<0, max>, string>}'

https://psalm.dev/r/21478194fc

<?php

namespace App;

class Entity {

    /**
    * @psalm-var array<non-negative-int, string>
	*/
    private $actions = [];
    
    public function __construct() {
        $this->actions[-1]= 'test';
    }
}

Psalm output (using commit 8329309):

ERROR: InvalidDocblock - 10:5 - array<non-negative-int, string> is not a valid type (from /var/www/vhosts/psalm.dev/httpdocs/src/somefile.php:7)

INFO: MixedArrayAssignment - 13:9 - Cannot access array value on mixed variable $this->actions[int]

INFO: MissingPropertyType - 10:13 - Property App\Entity::$actions does not have a declared type - consider array|mixed

https://psalm.dev/r/33769b88c8

<?php

namespace App;

class Entity {

    /**
    * @psalm-var array<\non-negative-int, string>
	*/
    private $actions = [];
    
    public function __construct() {
        $this->actions[-1]= 'test';
    }
}

Psalm output (using commit 8329309):

ERROR: InvalidPropertyAssignmentValue - 13:9 - $this->actions with declared type 'array<int<0, max>, string>' cannot be assigned type 'array{-1: 'test', ...<int<0, max>, string>}'

[orklah]

I answered here:
#9069 (comment)

There's a few keywords missing, are you up for a PR? :)