From myth earlier post. "When Hill offered the term semi-longbow, he did it in comparison to the English longbow, which, in fact, was quite a bit longer. Not uncommon for them to be 72 or more inches long.
"BTW, the D-shape referred to the cross section of an English longbow limb, not the strung profile of the bow, which also happened to be D shaped. The American Semi-longbow limb has a flatter, rectangular cross section, but does string up into a D shape profile."
According to Hill, an ASL's limbs were long (but not as long an an English longbow, thus the word semi-long)and rectangular in cross section. He didn't mention back set or string follow in his definition, but most of his early bows were string follow because they were all bamboo laminations and took a set naturally. I believe he started incorporating back set into his bows with the use of fiberglass which would hold the shape.
Whether the limbs are back set, straight or string follow, it doesn't change the definition of an ASL.