Nasty org-mode gotcha: "when updating [w/] ELPA, you have to install [org-mode] in a session where no Org function has been called already."
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I'm never sure how to convert words with hyphens into SCREAMING_SNAKE_CASE. For example, should built-in function be BUILT_IN_FUNCTION or BUILTIN_FUNCTION?
TIL Tcl has a notion of 'safe interpreters', a mode where you can run untrusted code in a sandbox: https://www.tcl.tk/man/tcl8.4/TclCmd/safe.htm
Not many programming languages have this, but it's way safer to include in the implementation than try to build as a userland library.
Today I learnt that Emacs 28 shipped a context-menu-mode! https://oylenshpeegul.gitlab.io/blog/posts/20230129/
This seems quintessentially Emacs: deeply hackable, but building UI features in an order very different to the mainstream.