Customizable default values for form

[DJanocha]

First of all, the library is GREAT and I want to thank you for your contributon to OSS.

Unfortunately I'm struggling with something.
Let's say there is a user field that I declared using:

const userDataValidator = z.object({
_id: z.string(),
name: z.string().optional(),
surname: z.string(),
age: z.number().default(0)
})
const editMyUserDataInputValidator = userDataValidator.partial().omit({_id:true})

And there is a procedure: userRouter.editMyUser:

  editUserData: userOnlyProcedure
    .input(editMyUserDataInputValidator)
    .mutation(async ({ input:currentUser, ctx }) => {
      const userDataService = await getUserDataService();
      const { userDataId } = ctx; // got from context after logging in
      await userDataService.findOneOrThrow({ _id: userDataId });
      const userData = await UserData.editOne(userDataId, currentUser);
      return {
        ok: true
      }
    }),

My procedure accepts partial user (without _id). So I can pass just the name and only the name will be used (like in PATCH rest verb).

Unfortunately if I try to update just the age field, the trpc-panel sends object filled with nulls instead of undefined values.
Therefore I must fill all of the users fields.
I don't really want to change all of my *.partial() to *.partial().nullable() throughout the whole codebase.
Is there a way to tell trpc-panel to just undefined as default, not-yet-set values? Of course I tried to find it by my own but didn't manage to do it.
Thanks you for your time.
Best regards!