`form.update` overwrites options instead of merging

[LouisHaftmann]

Describe the bug

When calling .update(newOpts) on a FormApi instance, the form options are overwritten instead of merged.

Example:

const form = new FormApi({
  asyncDebounceMs: 5000,
});

// prints `{ asyncDebounceMs: 5000 }`
console.log(form.options);

form.update({
  defaultValues: {
    test: '',
  },
});

// prints `{ defaultValues: { test: '' } }`
console.log(form.options);

Your minimal, reproducible example

https://stackblitz.com/edit/stackblitz-starters-hvxmtx?file=index.ts

Steps to reproduce

1. Call form.update(newOpts)

Expected behavior

I would expect the options to get merged instead of overwritten

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

• OS: macOS
• Browser: Arc (1.52.0)

TanStack Form adapter

None

TanStack Form version

v0.26.4

TypeScript version

No response

Additional context

This line is the cause of this bug: https://github.com/TanStack/form/blob/bde3b1cb3de955b47034f0bfaa43dec13c67999a/packages/form-core/src/FormApi.ts#L471

[crutchcorn]

This is correct behavior. You can merge options yourself using {...this.field.options, other: someVal}