Fix Collection::implode with \Stringable objects (with exception for Eloquent models)

src/Illuminate/Collections/Collection.php

@@ -5,6 +5,7 @@
 use ArrayAccess;
 use ArrayIterator;
 use Illuminate\Contracts\Support\CanBeEscapedWhenCastToString;
+use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Traits\EnumeratesValues;
 use Illuminate\Support\Traits\Macroable;
 use InvalidArgumentException;
@@ -627,8 +628,13 @@ public function implode($value, $glue = null)
         }
 
         $first = $this->first();
+        $pluck = is_array($first) || is_object($first);
 
-        if (is_array($first) || (is_object($first) && ! $first instanceof Stringable)) {
+        if ($first instanceof \Stringable && ! $first instanceof Model) {
+            $pluck = false;
+        }
+
+        if ($pluck) {
             return implode($glue ?? '', $this->pluck($value)->all());
         }
 

tests/Support/SupportCollectionTest.php

@@ -25,6 +25,7 @@
 use PHPUnit\Framework\TestCase;
 use ReflectionClass;
 use stdClass;
+use Symfony\Component\String\ByteString;
 use Symfony\Component\VarDumper\VarDumper;
 use Traversable;
 use UnexpectedValueException;
@@ -2332,6 +2333,13 @@ public function testImplode($collection)
         $this->assertSame('taylor-foo,dayle-bar', $data->implode(fn ($user) => $user['name'].'-'.$user['email'], ','));
     }
 
+    #[DataProvider('collectionClassProvider')]
+    public function testImplodeStringable($collection)
+    {
+        $data = new $collection([new ByteString('taylor'), new ByteString('dayle')]);
+        $this->assertSame('taylordayle', $data->implode(''));
+    }
+
     #[DataProvider('collectionClassProvider')]
     public function testImplodeModels($collection)
     {