Go でさまざまなシグネチャを持つ関数のスライスを効率的に管理するにはどうすればよいですか?

package main

import (
    "fmt"
    "reflect"
)

func A() {
    fmt.Println("A")
}

func B(a int) {
    fmt.Println("B", a)
}

func C(a string, b float32) {
    fmt.Println("C", a, b)
}

func main() {
    f := []interface{}{A, B, C}

    for _, v := range f {
        fn := reflect.ValueOf(v)
        fmt.Printf("Function: %v\n", fn.Type())

        numArgs := fn.Type().NumIn()
        fmt.Printf("Number of arguments: %v\n", numArgs)

        for i := 0; i < numArgs; i++ {
            argType := fn.Type().In(i)
            fmt.Printf("Arg %v Type: %v\n", i+1, argType)
        }

        fmt.Printf("Calling function using reflection...\n")
        callArgs := []reflect.Value{}
        for i := 0; i < numArgs; i++ {
            switch fn.Type().In(i).Kind() {
            case reflect.Int:
                callArgs = append(callArgs, reflect.ValueOf(i+1))
            case reflect.String:
                callArgs = append(callArgs, reflect.ValueOf(fmt.Sprintf("Arg-%v", i+1)))
            case reflect.Float32:
                callArgs = append(callArgs, reflect.ValueOf(float32(i+1)))
            }
        }
        fn.Call(callArgs)
    }
}