VerifyIssuedAt in mapclaims broken about jwt HOT 6 CLOSED

func (c CustomClaims) Valid() error {
        err := jwt.MapClaims{"exp": float64(c.ExpiresAt), "iat": c.IssuedAt, "iss": c.Issuer}.Valid()
        if err != nil {
                return err
        }
        if c.UserID == "" {
                return errors.New("missing userid")
        }
        if c.TenantID == "" {
                return errors.New("missing tenantid")
        }
        if c.PID == "" {
                return errors.New("missing pid")
        }
        return nil
}

package main

import (
    "errors"
    "fmt"
    "time"

    "github.com/golang-jwt/jwt"
)

type CustomClaims struct {
	UserID      string   `json:"userid"`
	TenantID    string	`json:"tenantid"`
	PID         string         `json:"pid"`
	Roles       []string       `json:"roles"`
	Permissions []string       `json:"permissions"`
	Parameters  []string       `json:"parameters"`
	jwt.StandardClaims
}

type CustomClaimsWrapper struct {
	CustomClaims
	Partial bool `json:"-"`
}

var JWTSecret string = ""

func main() {

	claims := CustomClaims{
		"1",
		"1",
		"1",
		[]string{"User"},
		[]string{"rtdb"},
		[]string{},
		jwt.StandardClaims{
			Issuer:    "jwt.test.org",
			ExpiresAt: time.Now().Add(15 * time.Minute).Unix(),
			IssuedAt:  time.Now().Unix(),
			Audience:  "my-audience",
		},
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)

	tokenString, err := token.SignedString([]byte(JWTSecret))
	if err != nil {
  	    fmt.Printf("Error signing token: %v\n", err)
	}


	var parsedClaims CustomClaimsWrapper

	_, error := jwt.ParseWithClaims(tokenString, &parsedClaims, func(token *jwt.Token) (interface{}, error) {
			if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
				return nil, fmt.Errorf("There was an error")
			}

			return []byte(JWTSecret), nil
	})

	if error != nil {
	    fmt.Printf("error: %v\n", error);
	}

}

func (c CustomClaims) Valid() error {
	err := jwt.MapClaims{"exp": float64(c.ExpiresAt), "iat": c.IssuedAt, "iss": c.Issuer}.Valid()
	if err != nil {
		return err
	}
	if c.UserID == "" {
		return errors.New("missing userid")
	}
	if c.TenantID == "" {
		return errors.New("missing tenantid")
	}
	if c.PID == "" {
		return errors.New("missing pid")
	}
	return nil
}