CodeIgniter\Model::cleanValidationRules() must be of the type array, string given

[niteraven7]

Validating data from form post with a rule set by name via controller, e.g:

$this->validate('account')

Throws this error:
Argument 1 passed to CodeIgniter\Model::cleanValidationRules() must be of the type array, string given, framework\system\Model.php on line 1259

This worked fine since alpha3... not working in alpha5.

[niteraven7]

Actually after a bit of further testing and digging- it does not appear to matter if the rule set is a name or array... the error stems from this line in the model:

protected $validationRules = 'account';

If I comment that out it works fine?

[niteraven7]

After even further digging- it appears this works:

protected $validationRules = ['account'];

From docs:
Contains either an array of validation rules as described in How to save your rules or a string containing the name of a validation group, as described in the same section. Described in more detail below.

I guess the array is new but it still states that a string will work?