Smalltalk's syntax very much reminds me of lisps of that era. Literal values are static and mutations persist!
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One subtle behaviour of Claude that wasn't obvious to me: whilst each conversation is transient, permissions persist across conversations.
So if you've given permission to run e.g. 'cargo test' or even 'cargo run', you need to be sure that all future invocations are safe too.
You can see the current permissions with /permissions.
Today I learnt that Emacs has a notion of 'permanent' variables! https://www.gnu.org/software/emacs/manual/html_node/elisp/Creating-Buffer_002dLocal.html
These are variables that persist even when you change major mode (which generally resets buffer-local variables).
Today I learnt you can make Emacs persist formatting to the file itself: http://t.co/qPOcINxAZw