The games console market is fascinating: there's incentive to *not* provide upgraded models.
You want the guarantee that a game for $X just works on any $X purchased.
E.g. the Switch OLED has a bigger screen, and a better CPU than the original, but it's downclocked to match the original Switch's CPU.
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I'm experimenting with jj this weekend. It seems pretty nice so far, but the mental model is pretty different from git.
For example, there's no `checkout` command. You do `jj new ABC` to switch to a commit, which creates a new empty commit on top of ABC.
It's wonderfully easy to switch out the allocator in Rust: https://doc.rust-lang.org/edition-guide/rust-next/no-jemalloc.html
Sadly it didn't help difftastic performance despite doing a lot of allocation, but it's really easy to try it!
The Nintendo Switch has a clever way of preventing firmware downgrades: upgrading the firmware blows an internal fuse!
https://news.ycombinator.com/item?id=27202766
This means that the hardware knows a newer firmware exists.