Comment by BoxOfRain

That reminds me of the old 'long S'[1] that used to exist in English and survives in the symbol for integration. That worked in a ſimlar way for writing Engliſh, at the ſtart and middle of words you'd use the long s but not at the end so you end up with 'poſſeſs' for 'possess'. There were other rules around it too, I think you'd always use the usual S for a capital.

[1]https://en.wikipedia.org/wiki/Long_s