Svelte form - `state_proxy_equality_mismatch` warnings when calling `field.handleChange()`

[Bladesheng]

Describe the bug

Each call to field.handleChange() generates multiple state_proxy_equality_mismatch svelte warning in console.

Your minimal, reproducible example

https://codesandbox.io/p/devbox/github/tanstack/form/tree/main/examples/svelte/simple?embed=1&theme=dark&file=src/App.svelte

Steps to reproduce

1. Open the simple example for svelte form - https://codesandbox.io/p/devbox/github/tanstack/form/tree/main/examples/svelte/simple?embed=1&theme=dark&file=src/App.svelte
2. Open devtools console
3. Type anything into first name
4. Each keystroke generates 7 state_proxy_equality_mismatch warnings in console.

Reactive `$state(...)` proxies and the values they proxy have different identities. Because of this, comparisons with `===` will produce unexpected results

Expected behavior

I expect no warning to be in console.

How often does this bug happen?

Every time

Screenshots or Videos

Platform

• Chrome 150
• Rocky Linux

TanStack Form adapter

svelte-form

TanStack Form version

1.33.2

TypeScript version

No response

Additional context

The warning appears in version 1.33.0 and up. They do not appear in version 1.32.1 and lower.