UltraViolet http://t.co/e02LiYLVDk has an interesting model of users proving they own a copy, then letting them stream from anywhere.
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"Example Driven Development" using Glamorous and Pharo Smalltalk: https://medium.com/feenk/an-example-of-example-driven-development-4dea0d995920
Tests returning values and composing is a really interesting model. It establishes structure and shows which test failure is the most 'fundamental'.
It's interesting to see the "why not Rust?" discussions around the TypeScript news that they're using Go. It shows that Rust has reached a level of maturity that it's a default for some users.
Go does seem to be in a sweet spot for AOT languages with GC though.
One interesting design choice in Emacs that I haven't seen in other editors: reserved shortcuts.
An Emacs extension shouldn't use F5 through F12, or Ctrl-c LETTER. This lets users configure their own shortcuts. https://www.gnu.org/software/emacs/manual/html_node/emacs/Key-Bindings.html
Does it exist elsewhere? I miss it in VS Code, where e.g. all the Fn keys are already assigned.