Extended server action using a custom helper causes unexpected error during validation triggered by Conform

[ChristianIvicevic]

Describe the bug and the expected behavior

In an attempt to reduce the need for separate files in Next.js projects I was looking forward to write a helper defining a server action that also exposes the schema so that its definition can be inlined/colocated in the action definition. This doesn't work unfortunately as Conform's validation seemingly attempts to access the custom property or does something unexpected with the passed schema causing errors.

TypeError: undefined is not an object (evaluating 'type._def')

Conform version

v1.2.2

Steps to Reproduce the Bug or Issue

1. Clone my fork over at https://github.com/ChristianIvicevic/conform/
2. Run the Next.js example and go to the login form
3. Enter some invalid email and move to the next field and notice how the error appears

What browsers are you seeing the problem on?

Chrome, Safari

Screenshots or Videos

No response

Additional context

You can check my latest commit adding my intended helper and how I'm referencing the schema: ChristianIvicevic@b1242ea

It's noticeable that it's triggered by Conform as the error gets delayed when you change the validation strategy to onSubmit. My gut feeling is that Conform attempts to manipulate or access the passed schema in a way that's not compatible with it being part of the action.