I was pondering if "vanilla" should be part of the name as well. In the end I felt I got sufficiently close to the vanilla flavor you describe, and the name conveys the "as little as possible" approach. Hope it's not too misleading!

I do like the "plus" idea, now that you mention it! Will think about it :)

Vanilla JS has also been a long-time joke about how modern javascript has advanced far enough not to need libraries for a lot of stuff people still reach for: http://vanilla-js.com/

Goes back to 2012 unchanged (hence the selection of libraries compared against): https://web.archive.org/web/20120825232614/http://vanilla-js...

Edit to add: Having been around in that era, I see "Vanilla Prime" as a whole new framework, nothing vanilla about it.

Maybe vanillin, the essence of vanilla, but not quite the same thing?

Honestly, I think it is totally misleading. As misleading as calling cloud services serverless. Vanilla JS already have a well-established meaning

In mathematics, if f is a function, f' (pronounced eff prime) is a modified/different but related function.

I think the name already acknowledges it isn't quite vanilla.

Usually f'(x) denotes the differential of f(x), doesn't it?

Prime doesn't necessarily need to denote anything specific, but often means 'different, but related'. It is common to use prime notation to reflect a derivative function in calculus, but like most things it depends on context.

It was Lagrange's notation, I believe. As opposed to Leibniz's notation which is the dy/dx notation that is all the rage now.

Now that's a cool accident... thanks for sharing :)