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Actually, it's 2 things:
1 - I don't think "first_class" and "last_class" fuel_nav() parameters work for the breadcrumb render_type
2 - For screen-reader Aria support, we're supposed to mark the last item on the breadcrumb line with aria-current="page"
I guess a "first_attribute" and "last_attribute" (along the lines of "first_class" and "last_class" parameters) would allow developers to add the aria support in a flexible fashion?