Observation RE: addTag();

This is just an observation.

When we add a tag to a recipe, we have it set-up singular to add one tag at a time.

public function addTag($tag)
    {
        $this->tags[] = strtolower($tag);
    }

But the recipes Alena provided us with to populate the recipes have several tags, and are not comma separated. A few examples....

$belgian_waffles->addTag("breakfast, quick bread");
$granola_muffins->addTag("breakfast, snack, quick bread");
$lasagna->addTag("dinner,italian");

For me personally, this will cause problems in the future lessons when displaying the Recipe Titles that are filtered by a tag. For example, to find the belgian waffles recipe using a tag filter, you would need to add the argument as "breakfast, quick bread" instead of just "breakfast" for example.

I look forward to receiving your insight on this. Is there a reason I am overlooking?

Thanks in advance!