我想了解 go1.18 中的泛型實現。在我的測試示例中，我存儲了一系列測試用例并嘗試調用一個函數變量。不幸的是，當我嘗試使用變量tc.input時EvalCases函數出現錯誤，我收到以下錯誤：不能使用輸入（受 Inputer 約束的 T 類型變量）作為 fn 參數中的字符串類型為什么我會收到該錯誤，我該如何解決？import (    "fmt"    "strconv")type BoolCase func(string) booltype Inputer interface {    int | float64 | ~string}type Wanter interface {    Inputer | bool}type TestCase[T Inputer, U Wanter] struct {    input T    want  U}type TestConditions[T Inputer, U Wanter] map[string]TestCase[T, U]// IsNumeric validates that a string is either a valid int64 or float64func IsNumeric(s string) bool {    _, err := strconv.ParseFloat(s, 64)    return err == nil}func EvalCases[T Inputer, U Wanter](cases TestConditions[T, U], fn BoolCase) {    for name, tc := range cases {        input := T(tc.input)        want := tc.want                // Error: cannot use input (variable of type T constrained by Inputer) as type string in argument to fn        got := fn(input)        fmt.Printf("name: %-20s | input: %-10v | want: %-10v | got: %v\n", name, input, want, got)    }}func main() {    var cases = TestConditions[string, bool]{        "empty":   {input: "", want: false},        "integer": {input: "123", want: true},        "float":   {input: "123.456", want: true},    }    fn := IsNumeric    EvalCases(cases, fn)}