I’ve been gradually warming to the API over the course of the thread.
These didn’t matter to me because of guarantees provided by my own context. But I can see so many ways a developer could write broken code on top of this without knowing. You’ve convinced me offsets are the better default.
I’ve also looked closer at the prototype implementation and reconsidered my existing use cases, asking how I have might have written them if this API had already been available. I believe I can get the same level of performance for all the same use cases just by refactoring at the usage site. It just requires thinking differently. So in the end I would probably not use any of the customization I asked for upthread after all.
I consider all my concerns answered and my vote is now a in favour of the API more‐or‐less as proposed. (I’ll stay out of the naming discussion. Any variation is fine with me.) Thank you for writing it @numist, and for patiently pushing back when I started asking questions.