I want to build a custom Zod validator as follows:

const stringOrNumberValidator = (val: any) => {
    if (typeof val === "number" && !isNaN(val)) {
        return val;
    } else if (typeof val === "string" && !isNaN(Number(val))) {
        return Number(val);
    } else {
        return "Invalid";
    }
};

const stringOrNumber = z.custom(stringOrNumberValidator);

const xSchema = z.object({
    age: stringOrNumber,
});

const data = {
    age: "2s0"
};

const ret = xSchema.safeParse(data);
console.log(ret);

The above does not work and always returns success as true. If I throw an error instead of return "Invalid", the error gets thrown and execution stops although I have used safeParse

I further want to extend the validation using the inbuilt Zod functions like min, max as follows

const xSchema = z.object({
    age: stringOrNumber.min(5).max(25)
});

How can I achieve this?