I assumed an ordinary person. My parents use the “한영키” to switch between Hangul and the alphabet. While I’m geeky enough to configure my Caps Lock key to function like that switch, most people wouldn’t even imagine that functionality is configurable.
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If you’re okay with ibus-hangul, you can configure the keyroard shortcut for Gram.

Click “Add” and press “한/영” key on the keyboard.
ibus
All Korean keyboards, including the one on my LG Gram (which is a Korean model), have a dedicated key for switching between English and Korean (the “한영키”). Everyone who isn’t technically inclined uses this key. Using Ctrl + Space is a bad user experience.
Thank you for your kind words! Meanwhile, thanks to logging_strict, I discovered that GA and Beta milestones are set on the https://github.com/astral-sh/ty/milestones page, and the Beta milestone is 69% complete. Looking forward to ty’s GA.
I posted because I was happy to see some software in growing up. If you are not comfortable, I will not post this kind again.
I wonder if they want to be the Astral of the JavaScript world, and if that’s even possible.