"Lloyd E. Sponenburgh" lloydspinsidemindspring.com fired this volley
in . 3.70:

That is an autoformer. It is not necessary for the line input to span
both the primary and secondary for it to qualify, only that the
primary and secondary be common at one of their legs.

But I might add, that a buck-boost arrangement could be made to work in
buck by running the line across both primary and secondary, then taking the
one load line off the junction between the two. (and vice versa)

LLoyd