Svelte 5 forward bind:group

[noclat]

Describe the bug

Hi, been playing with Svelte 5 and noticed even though you can have arbitrary property binding with $bindable(), forwarding a state to bind:group doesn't work on <input type="checkbox" />. Clicking on any checkbox would reset the group state array with its value instead of toggling it. Is this a known bug? Or am I doing something wrong? It's a big roadblock to making component libraries.

Reproduction

https://svelte-5-preview.vercel.app/#H4sIAAAAAAAAE41STY-bMBD9KyN3tRApgp5ZoF_HHvawvSU5ODAEt8a2bJO2Qvz32tigpdtDlQOel5nn5_dmIh3jaEhxmoigA5KCfFKKHIn9rXxh7sgtutrIUTceKU2jmbL1WQCwQUlt4UuPzY-r_AWdlgMkWb4CWRhPns7Ct3O0rmVk9llZJoWBCk6Ju45jcoTkMxXu50_Pmorbgn1lP1lyedoN-7EHY6nF9HQ5ROoHJozCxqahxcNlvil1Rcvui-TpHdKm38ugJtSzbwAot_d4R6ozCZxnAnfKR6ym0AxXJtripuWoImTmOjC4a3aEmyFBQu4lLP9tV4XGxlfYrnQZR3GzPVRVtRMc8cjuVKBFPTDhLPl7tPzXIDw-wr6thveRTYqm9-5XU4oHqGpIN9Mxa0atUdhvVN_QZlEtfNi7WYCLZWGLbrwgd8kA5Xx58t6MUtUvg5S2Z1jAKv67ZCL1-R_mMle1zzLk5xZxkC3rGLaksHrE-bjt7Ur7v8vrF2qCJT-_UT5NeuWYHo4uB8Zb99IjZFmmtFQGZt-zHNO3y8XpFXl4DhNqtOHdXoXbnmaNmAR4Wjmj46_XaPkseB63lXWbmtg_fXTnFvWGp8HtKWfd7JWtat6adZn_AHW3NoPwAwAA

Logs

[Log] update – ["Banana"] (1) (chunk-GHMOWVGZ.js, line 1619)
[Log] update – ["Orange"] (1) (chunk-GHMOWVGZ.js, line 1619)
[Log] update – ["Kiwi"] (1) (chunk-GHMOWVGZ.js, line 1619)

System Info

System:
    OS: macOS 14.3.1
    CPU: (8) arm64 Apple M2
    Memory: 146.28 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.10.0 - ~/.nvm/versions/node/v20.10.0/bin/node
    npm: 10.3.0 - ~/.nvm/versions/node/v20.10.0/bin/npm
  Browsers:
    Chrome: 123.0.6312.87
    Safari: 17.3.1
  npmPackages:
    svelte: ^5.0.0-next.85 => 5.0.0-next.85

Severity

blocking an upgrade

[dummdidumm]

Closing as duplicate of #2308