Clearly the author has never used Emacs, because they have confused Emacs "modes" (which are more like features that get turned on and off) with modal editing (like vim).
There are also plenty of markdown preview packages available for both Vim and Emacs (even live preview). Emacs has had preview-latex since before Atom even existed.
Please also take note that this (completely reasonable email) is some of the so-called "bad behavior" and "arrogance" that the author of the article is purportedly describing.
It's not. The article is bad and wrong. It preemptively tries to dodge such accusations, but most of the hyperbole and "emotions" are just downright lies.
btw the person you responded to is the author of magit. I think his opinion should be weighted more heavily that the author of this article.
It's correct as it is. Performance can be good or bad. "...for efficiency" would be correct, but if they were to write only "...for performance" it would missing a qualifier.
You may be interested in an interactive jq tool like jiq or others: https://github.com/fiatjaf/awesome-jq (do a ctrl-f for "interactive" on this page).
Assuming you're talking about the "chorus" where the lyrics are "Battery --- Ba-ter-ry!":
"Battery" is certainly not the same type of "whatever" as "Master of Puppets". It's also not cut short. They're adding in an extra beat (a quarter note), resulting in one measure of 5/4 (or an extra measure of 1/4, but the notation makes more sense in 5/4). I think it's clear that this was intentionally and explicitly composed with an extra beat (Metallica adds or removes quarter notes in riffs fairly often).
"Master of Puppets" on the other hand was very likely not intentionally composed in 21/32, but I think it was intentionally composed with the "microtiming" in mind as a feeling.
A lot of people in this thread seem to think it may have just been Lars's fault as a crappy drummer. But James was notoriously meticulous with the tightness of that album as a whole (and AJFA). This is not sloppiness and it's not 21/32. It was intentionally composed by feel or by informal directing ("let's do that part by skipping a little, like ba-DUM-DUM, you know?").
Not really the chorus, but mostly the instrumental part at the beginning (after the, let's say, acoustic-slow part). I think there's some short timings there too.
That's the Core reference guide. You might want the book "Programming Ruby"[1], which is linked on the documentation landing page[2]. Alternatively, for a quick overview, I recommend Learn X in Y Minutes[3].
Only the "treemap" chart is broken for me, everything else seems to work ok (Firefox Developer Edition 111.0b6 64-bit Linux. Enhanced tracking protection turned on).
There are also plenty of markdown preview packages available for both Vim and Emacs (even live preview). Emacs has had preview-latex since before Atom even existed.