Multi step is merging validated data only on top level of the form data object.

[ktarmyshov]

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Description
If it's expected behaviour, then please close.
I have complex form (dataType: json), which is filled via several steps (multi step form). Some of the objects, that are processed, sit not in the top of the form object. So, when I set options.validators to the part I want to validate, I must ensure that I have everywhere z.catchall(z.record(z.any())), so the data in the same subtree will not be lost.

There is a code somewhere where the validated data is merged with the current data via {...currentData, ...newValidatedData} on top level - similar issue to #532.

const complexSchema = z.object({
  someTop1: z.object({}),
  someTop2: z.object({
     someLow2: z.record(z.string(), MyStepSchema),  // these are the steps I am processing
  }),
})

const stepValidationSchema = z.object({
    someTop2: z.object({
      someLow2: z.object({
        [myStepId]: MyStepSchema
      }).catchall(z.record(z.any()))
    }).catchall(z.record(z.any()))
  }).catchall(z.record(z.any()));

Maybe it's not a bug, but it would certainly be helpful, if there would be a way to say to superforms - "hey, this is not final validation, but just a step/partial, please merge, not overwrite". Would have less boilerplate to handle.

Thank you!
Konstantin

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