I taught this when I helped Reptile Scans for the first time. But I can't actually apply this rule for all fonts. One font that I'm using that have no one stroke I is Synchro Let. I've read about this from somewhere, So I didn't made it up. And if I'm wrong, TBF, it looks neater too.
tips : some fonts have one stroke for the uppercase I use | for the crossbar one.