Is there a method func for functions to get information of a function?

Question

//as we can return a function in go

//as we can pass function as a parameter in go

Here is what I mean by information of a function:

• list of returned (data/function) types

• list of its arguments (data/function) types with values

My general Goal is to get rid of very small ( super small near zero ) probabilities of some random values returned by function results.

The problem is that there ( super small near zero ) probability of duplicate results. it gets greater as the length of the result wanted gets smaller, and greater if generate more random values. ( are countless in my case )

here is an example :

func RandomPassword(min, max int) string {
    ...
    return password
}

func RandomEmail() string {
    return RandomStr(6) + "@" + RandomStr(6) + ".com" 
    // 6 is length of the returned string
}

func RandomName() string {
    return RandomStr(12)
}

so I implemented a function to check whether two results are equal or not. he is my approach, but I don't know how to get information of a method using the reflect package, (which is my question)

//r is my random value
//f is a function that returns a random value

func RandomMustDiff(r any, f func(...any)) {

    // if return(data/function)types == reflect.TypeOf(r) {
    panic("types aren't equal")
    }

    // get the function arguments
    args := f.args()
    

    // check-results code
    if r != f(args) {
        return RandomMustDiff(r, f(args))
    }

}