Unexpected property "ignoreReadonly" in svelte/prefer-const

[uh-zuh]

Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.

What version of ESLint are you using?

9.28.0

What version of eslint-plugin-svelte are you using?

3.9.0

What did you do?

Configuration

'svelte/prefer-const': [
    'error',
    {
        destructuring:  'all',
        ignoreReadonly: true,
    },
]

I've added option ignoreReadonly described here:
https://sveltejs.github.io/eslint-plugin-svelte/rules/prefer-const/
and then run npm run lint:dev

What did you expect to happen?

No errors

What actually happened?

Error: Key "rules": Key "svelte/prefer-const":
        Value {"destructuring":"all","ignoreReadBeforeAssign":false,"ignoreReadonly":true} should NOT have additional properties.
                Unexpected property "ignoreReadonly". Expected properties: "destructuring", "ignoreReadBeforeAssign", "excludedRunes".

Link to GitHub Repo with Minimal Reproducible Example

https://eslint-online-playground.netlify.app/#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

Additional comments

Seems like doc is outdated.
It's need to remove ignoreReadonly and add ignoreReadBeforeAssign option.

[baseballyama]

This issue is resolved in v3.9.1.

[uh-zuh]

@baseballyama
There is still 2 different options.
One in a example:

"additionalProperties": false,

and another in description below example:

ignoreReadBeforeAssign