[Tiereven]

n prefix to indicate negative is a strange choice. I suspect it will have unwanted repercussions, i.e. what about a variable named `n`?

I'll admit though, I'd never really considered that overloading the dash symbol to mean so many things was strange until I read this. It still seems like inventing a new nomenclature for negative numbers is a bit reaching for spreadsheet software.

edit I'm not sure I understand what problem is being solved here either. What does negative spreadsheet indexes give us that positive-only indexes didn't?

edit 2 None of this is to downplay what OP & co is doing here. I'm hugely thankful for the community behind any effort to open source key pieces of technology. I don't use spreadsheets on a regular basis, but when I do, I am always impressed by their ability to flexibly solve problems. Awesome work making this technology modern and open source.