After leaking more than a communal tap, the iPhone Duo — Apple’s first foldable — is finally a reality. We are used to foldables around here, but for Apple, this is the first and only major new iPhone form factor in 19 years since the original iPhone. Needless to say, that’s a pretty big deal.But as stated before, foldables are not new to us. By now, the original Galaxy Fold units have completed seven trips around the Sun, and we have seen countless models from every other major manufacturer since then. Some have come and gone in such a blink of an eye that many people won’t even...