Serialize any stringable object

Author: gapple

src/Serializer.php

@@ -77,14 +77,14 @@ private static function serializeBareItem($value): string
             return self::serializeInteger($value);
         } elseif (is_float($value)) {
             return self::serializeDecimal($value);
-        } elseif (is_string($value)) {
-            return self::serializeString($value);
-        } elseif ($value instanceof Token) {
-            return self::serializeToken($value);
         } elseif (is_bool($value)) {
             return self::serializeBoolean($value);
+        } elseif ($value instanceof Token) {
+            return self::serializeToken($value);
         } elseif ($value instanceof Bytes) {
             return self::serializeByteSequence($value);
+        } elseif (is_string($value) || (is_object($value) && method_exists($value, '__toString'))) {
+            return self::serializeString($value);
         }
 
         throw new SerializeException("Unrecognized type");

tests/SerializeStringTest.php

@@ -15,7 +15,35 @@ class SerializeStringTest extends TestCase
     public function testInvalidCharacter()
     {
         $this->expectException(SerializeException::class);
+        $this->expectExceptionMessage("Invalid characters in string");
 
         Serializer::serializeItem("🙁");
     }
+
+    public function testStringableObject()
+    {
+        $stringable = new class {
+            public function __toString(): string
+            {
+                return "Don't Panic";
+            }
+        };
+
+        $this->assertEquals('"Don\'t Panic"', Serializer::serializeItem($stringable));
+    }
+
+    public function testInvalidStringableObject()
+    {
+        $this->expectException(SerializeException::class);
+        $this->expectExceptionMessage("Invalid characters in string");
+
+        $stringable = new class {
+            public function __toString(): string
+            {
+                return "🙁";
+            }
+        };
+
+        Serializer::serializeItem($stringable);
+    }
 }