Subscribe errors with NaN

Describe the bug

The library actually works fine but Next.js shows an error in the bottom left corner and It's annoying, functionality is not affected AFAICT.

This only happens when I use NaN as defaultValue and then try to Subscribe to the value, it doesn't when using a empty string, it also works with zero as defaultValue.

What are the general recommendation about defaultValues ?

Call Stack

createUnhandledError ../../node_modules/next/src/client/components/errors/console-error.ts (18:35) handleClientError ../../node_modules/next/src/client/components/errors/use-error-handler.ts (31:33) console.error ../../node_modules/next/src/client/components/globals/intercept-console-error.ts (32:26) mountSyncExternalStore ../../node_modules/next/dist/compiled/react-dom/cjs/react-dom-client.development.js (5533:20) Object.useSyncExternalStore ../../node_modules/next/dist/compiled/react-dom/cjs/react-dom-client.development.js (23063:16) exports.useSyncExternalStore ../../node_modules/next/dist/compiled/react/cjs/react.development.js (1231:34) exports.useSyncExternalStoreWithSelector ../../node_modules/use-sync-external-store/cjs/use-sync-external-store-shim/with-selector.development.js (82:19) useStore ../../node_modules/@tanstack/react-store/src/index.ts (23:17) LocalSubscribe ../../node_modules/@tanstack/react-form/src/useForm.tsx (132:16) useForm.useState ../../node_modules/@tanstack/react-form/src/useForm.tsx (198:9) MyForm app/example/form.tsx (129:15) Page app/example/page.tsx (28:7)

Your minimal, reproducible example

https://github.com/pedro757/form-subscribe-error-NaN

Steps to reproduce

1. bun dev
2. See the error in the bottom left corner

Expected behavior

Not displaying the error

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

• OS: Linux
• Browser: Chromium
• Browser Version: 134

TanStack Form adapter

react-form

TanStack Form version

v1.1.2 sandbox is latest

TypeScript version

v5.8.2

Additional context

No response

Start with the linked minimal reproduction by running bun dev, then inspect the reported paths app/example/form.tsx and app/example/page.tsx around the subscription using NaN as the default value. Compare this behavior with an empty string or zero and verify that subscribing no longer produces the Next.js client error.