Submit "null" value

[ruigomeseu]

If I have a field that can be either null or a number.

I have my validator setup so it accepts the string 'Default' instead of null, to avoid confusion between a empty field and actually null.

export const validator = withZod(
  z.object({
    field: z.string().transform((val) => (val === 'Default' ? null : Number(val))),
  })
);

<ValidatedForm
  validator={validator}
  method="POST"
  defaultValues={{
    field: account.field ?? 'Default',
  }}
>
  <Input type="text" name="field" label="Field - Use 'Default' to use platform wide default" />
  <SubmitButton variant="default">Save</SubmitButton>
</ValidatedForm>

It appears that the transform is affecting the type of field, since I get this TypeScript error:
Type 'string | number' is not assignable to type 'number | null | undefined'. (this is when setting the defaultValues.field)

account.field is a Number.

Is there any workaround so my form input can accept 'Default' or a number, and my action receives a Number or null, without me having to transform field inside the action itself?