But it can be credibly interpreted as describing neither one, i.e. not attempting to describe the shape of the earth at all.
Just the Fathers' comments on the firmament say otherwise. If all their commentary on the firmament was the only place Scripture described the earth, that would almost be enough to eliminate globe earth because the Fathers talk quite a bit about it being a vault-like structure above earth, a dome, a tent, an expanse, and that it divides the water above from the water below. How does a dome/tent/vault apply to a globe? The division of water is pretty telling as well. Now, since some might stretch these things to accommodate the globe, there are other aspects of what the Fathers have expounded on that help close the gaps. Beyond that, the Fathers' silence on the globe is deafening.