svelte5: reactivity package classes are not fine-grained

[FoHoOV]

Describe the bug

URL

1. in this REPL things that didn't change still run the effects. (click on buttons mulitple times, see the effects rerun and they also run for things that didn't change)
2. see this REPL. changes on url.searchParams dont reflect on url object.

SET

1. In this REPL items that don't exist in the set will cause reactivity when they shouldn't. clicking on delete 1 btn shouldn't rerun the effect for has
2. In this REPL click on clear and then try the add/delete buttons, nothing is fine-grained anymore everything gets called

MAP

same problems as SET. in this REPL, click on clear then click on set 2 to 2.

DATE

anything that changes internal time value of Date will cause reactivity for every read method.

1. go to this REPL
2. clicking on setMillis should not be logging anything
3. clicking on setMinutes should not log anything for getUTCHours

Reproduction

see description

Logs

No response

System Info

svelte5-next137

Severity

annoyance

[FoHoOV]

Just wanted to mention that Date also has a similar issue. Any updates to the date object will cause reactivity for every read method.
There is a fix for date in #11774 (if #11504 is accepted)

[FoHoOV]

@dummdidumm can you reopen this issue because its not fixed. I've also edited the original issue to add date examples.