Example using generic type parameter

parser.go

@@ -93,7 +93,7 @@ func (p *Parser) ParseWithClaims(tokenString string, claims Claims, keyFunc Keyf
 	}
 
 	switch have := got.(type) {
-	case VerificationKeySet:
+	case VerificationKeySet[VerificationKey]:
 		if len(have.Keys) == 0 {
 			return token, newError("keyfunc returned empty verification key set", ErrTokenUnverifiable)
 		}

parser_test.go

@@ -30,22 +30,26 @@ var (
 	nilKeyFunc             jwt.Keyfunc = nil
 	multipleZeroKeyFunc    jwt.Keyfunc = func(t *jwt.Token) (interface{}, error) { return []interface{}{}, nil }
 	multipleEmptyKeyFunc   jwt.Keyfunc = func(t *jwt.Token) (interface{}, error) {
-		return jwt.VerificationKeySet{Keys: []jwt.VerificationKey{nil, nil}}, nil
+		keys := []jwt.VerificationKey{nil, nil}
+		return jwt.VerificationKeySet[jwt.VerificationKey]{Keys: keys}, nil
 	}
 	multipleVerificationKeysFunc jwt.Keyfunc = func(t *jwt.Token) (interface{}, error) {
 		return []jwt.VerificationKey{jwtTestDefaultKey, jwtTestEC256PublicKey}, nil
 	}
 	multipleLastKeyFunc jwt.Keyfunc = func(t *jwt.Token) (interface{}, error) {
-		return jwt.VerificationKeySet{Keys: []jwt.VerificationKey{jwtTestEC256PublicKey, jwtTestDefaultKey}}, nil
+		keys := []jwt.VerificationKey{jwtTestEC256PublicKey, jwtTestDefaultKey}
+		return jwt.VerificationKeySet[jwt.VerificationKey]{Keys: keys}, nil
 	}
 	multipleFirstKeyFunc jwt.Keyfunc = func(t *jwt.Token) (interface{}, error) {
-		return jwt.VerificationKeySet{Keys: []jwt.VerificationKey{jwtTestDefaultKey, jwtTestEC256PublicKey}}, nil
+		keys := []jwt.VerificationKey{jwtTestDefaultKey, jwtTestEC256PublicKey}
+		return jwt.VerificationKeySet[jwt.VerificationKey]{Keys: keys}, nil
 	}
 	multipleAltTypedKeyFunc jwt.Keyfunc = func(t *jwt.Token) (interface{}, error) {
-		return jwt.VerificationKeySet{Keys: []jwt.VerificationKey{jwtTestDefaultKey, jwtTestDefaultKey}}, nil
+		keys := []jwt.VerificationKey{jwtTestDefaultKey, jwtTestDefaultKey}
+		return jwt.VerificationKeySet[jwt.VerificationKey]{Keys: keys}, nil
 	}
 	emptyVerificationKeySetFunc jwt.Keyfunc = func(t *jwt.Token) (interface{}, error) {
-		return jwt.VerificationKeySet{}, nil
+		return jwt.VerificationKeySet[jwt.VerificationKey]{}, nil
 	}
 )
 

token.go

@@ -21,8 +21,8 @@ type VerificationKey interface {
 }
 
 // VerificationKeySet is a set of public or secret keys. It is used by the parser to verify a token.
-type VerificationKeySet struct {
-	Keys []VerificationKey
+type VerificationKeySet[T VerificationKey] struct {
+	Keys []T
 }
 
 // Token represents a JWT Token.  Different fields will be used depending on