Hello, I would like some guidelines for the best approach to extend the rainblab user plugin with the nullable trait in the model. I've tried to make a behavior but it doesn't do the trick:

<?php namespace MyPlugin\Member\Behaviors;

use October\Rain\Database\Traits\Nullable as NullableTrait;

class Nullable extends \October\Rain\Database\ModelBehavior
{
    use NullableTrait;

    protected $nullable = [];

    public function __call($name, $params = null)
    {
        if (!method_exists($this, $name) || !is_callable($this, $name)) {
            return call_user_func_array([$this->model, $name], $params);
        }
    }
}

and then, in the boot method of my Plugin:

public function boot()
    {
        UserModel::extend(function($model) {
            $model->implement[] = 'MyPlugin.Member.Behaviors.Nullable';
            $model->addDynamicProperty('nullable', ['lpm_gender']);
        });
    }