Improve PackingFailedException message

Author: rybakit

src/Exception/PackingFailedException.php

@@ -18,7 +18,7 @@ class PackingFailedException extends \RuntimeException
      */
     public static function unsupportedType($value) : self
     {
-        return new self(\sprintf('Unsupported type "%s", maybe you forgot to register the type transformer?',
+        return new self(\sprintf('Unsupported type "%s", maybe you forgot to register the type transformer or extension?',
             \is_object($value) ? \get_class($value) : \gettype($value)
         ));
     }

tests/Unit/PackerTest.php

@@ -47,7 +47,9 @@ public function testPack($raw, string $packed) : void
     public function testPackThrowsExceptionOnUnsupportedType($value, string $type) : void
     {
         $this->expectException(PackingFailedException::class);
-        $this->expectExceptionMessage("Unsupported type \"$type\", maybe you forgot to register the type transformer?");
+        $this->expectExceptionMessage(
+            "Unsupported type \"$type\", maybe you forgot to register the type transformer or extension?"
+        );
 
         $this->packer->pack($value);
     }
@@ -183,7 +185,9 @@ public function testPackThrowsExceptionOnUnsupportedCustomType() : void
         $packer = $this->packer->extendWith($transformer);
 
         $this->expectException(PackingFailedException::class);
-        $this->expectExceptionMessage('Unsupported type "stdClass", maybe you forgot to register the type transformer?');
+        $this->expectExceptionMessage(
+            'Unsupported type "stdClass", maybe you forgot to register the type transformer or extension?'
+        );
 
         $packer->pack($obj);
     }