Add option to set defaultvalues to undefined / null

[fendyk]

Currently its not possible to set certain defaultvalues to undefined if we use a validator like Valibot. In the example shown below, we have a schema where we have a complex object that has many properties and nested values

        const formSchema = v.object({
	        name: v.pipe(v.string(), v.minLength(3), v.maxLength(50)),
	        description: v.pipe(v.string(), v.minLength(3), v.maxLength(400)),
	        someComplexObject: SomeComplexObjectSchema,
        })
        
        type FormSchema = v.InferInput<typeof formSchema>;

	const form = useForm<FormSchema, ValibotValidator>({
		defaultValues: {
			name: "",
                         description: "",
                         someComplexObject: undefined // Not possible, we would have to set a initial value
		},
		onSubmit: async ({ value }) => {
		},
		validatorAdapter: valibotValidator(),
	});

Would be even nicer to only select the defaultValues you want, something like:

		defaultValues: { // Select properties you only want a default for
			name: "",
                         description: ""
		},

[crutchcorn]

What issues are you seeing when using undefined?

[fendyk]

I have to set all the defaultValue properties to the exact form schema:

	const form = useForm<FormSchema, ValibotValidator>({
		defaultValues: { // Cant do this, I am required to set description + someComplexObject
			name: "",
		},
		onSubmit: async ({ value }) => {
		},
		validatorAdapter: valibotValidator(),
	});

error:

Type '{ name: string; }' is missing the following properties from type '{ name: string; description: string; someComplexObject: { someField: string; someOtherField: number; someOtherField2: number; }; }': description, someComplexObject

[fendyk]

and with setting a property undefined i get error 'undefined is not assignable to type FormSchema`

[fendyk]

I created a stackblitz example to show the exact replication of the issue I am facing @crutchcorn