perf: Svelte 5 hydration comparisons failing

[benmccann]

Describe the bug

My site has some code:

<button aria-expanded={ showing === i} ... />

The aria-expanded attribute is a boolean, but gets compared to a string. As a result, the hydration code believes that the DOM needs to be updated which is a relatively expensive operation

I've included some suggestions from Rich and Dominik below regarding fixes

Reproduction

Simply put the code above in a SvelteKit project

Logs

No response

System Info

I'm on `5.0.0-next.1`

Severity

annoyance

[Rich-Harris]

try 5.0.0-next.3 #9475

[benmccann]

Oops. I was checking for PRs, but only in the open queue. It got merged too fast for me to notice you'd fixed it already 😆 Confirmed that it does work