Reactivity doesn't work for store with nested array when referenced by $

[juliancox]

Describe the bug

Reactivity is broken for a store that is an object with a nested array eg: store = writable({arr: [{a: 1}]) if that array is referenced by the store $ notation eg {#each $store.arr as item}
replacing $ with get works as expected eg: {#each get(store).arr as item}

Reproduction

https://svelte.dev/repl/4bc891afdcf543d482ca1a14d2d23fc4?version=3.20.1

Logs

No response

System Info

System:
    OS: macOS 11.5.2
    CPU: (8) arm64 Apple M1
    Memory: 115.48 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 14.17.3 - ~/.nvm/versions/node/v14.17.3/bin/node
    Yarn: 1.22.10 - ~/.nvm/versions/node/v14.17.3/bin/yarn
    npm: 6.14.13 - ~/.nvm/versions/node/v14.17.3/bin/npm
  Browsers:
    Chrome: 93.0.4577.82
    Edge: 93.0.961.52
    Firefox: 92.0
    Safari: 14.1.2
  npmPackages:
    svelte: ^3.35.0 => 3.42.5

Severity

annoyance

[Addeuz]

That's weird, it works for me in this REPL I just created because I'm opening an issue shortly about another problem I had about similar objects being updated in a store even though I'm only binding one.

I have svelte v3.34.0 but that should not matter.

[rmunn]

The reproduction REPL is using an old version of Svelte: https://svelte.dev/repl/4bc891afdcf543d482ca1a14d2d23fc4?version=3.20.1

Change the version to version=3, which will automatically pull the latest version of Svelte 3.x, and all the "not reactive" examples become reactive as they should be: https://svelte.dev/repl/4bc891afdcf543d482ca1a14d2d23fc4?version=3

So I think this is a bug that's already been fixed and you're just using a version of Svelte from before the bug was fixed.

[Conduitry]

Indeed, this was fixed a year ago in 3.25.0, and sounds like #5286. Please only open issues about the current version of Svelte.

[juliancox]

Doh!, Sorry about that. Maybe adding a banner to repl when not on the latest version would stop dolts like me wasting everyone's time.