Access raw Eloquent mutated attribute value in Laravel 5

Say I have a model Foo and I'm mutating an attribute getter, like so:

class Foo extends Model
{   
    protected $table = 'foo';

    public function getSomeBarAttribute($value)
    {
        return some_function($value);
    }
}

Is there a way to access the attribute's raw value, pre-mutation?

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