Improve Execution of Refine Function

[trotteral]

Hi,

let's assume i got the following code:

const schema = z
  .object({
    val1: z.number(),
    val2: z.number(),
    val3: z.number(),
  })
  .refine(
    (data) => {
      return data.val1 + data.val2 <= 10;
    },
    { path: ["val1", "val2"] }
  );

const result1 = schema.safeParse({ val1: 1, val2: 12 });
const result2 = schema.safeParse({ val1: 1, val2: 12, val3: 2 });

In the above example, the refine function should validate that the sum of val1 and val2 is less than or equal to 10. However, if val3 is missing from the input object, the refine function doesn't get executed at all, even though val3 is not involved in the validation process.

result1
{"success":false,"error":{"issues":[{"code":"invalid_type","expected":"number","received":"undefined","path":["val3"],"message":"Required"}],"name":"ZodError"}}

result2
{"success":false,"error":{"issues":[{"code":"custom","path":["val1","val2"],"message":"Invalid input"}],"name":"ZodError"}}

is it possible, that the refine function gets executed as soon as the values specified in the path array are set and validated, regardless of the presence of other fields in the input object.