For anyone using sveltekit - I recently wrote a little clarifier on what is going on with stores (as compared to how we get to use them in svelte). Though they aren't TECHNICALLY broken, they don't work as expected and leak data .. sooo... (what is that computation theory called where things should work how we expect them to work? ). How to avoid that is there too: https://dev.to/brendanmatkin/safe-sveltekit-stores-for-ssr-5a0h

Principle of least surprise?

Yes! aka Principle of least astonishment thank you!