Use Stringable when possible

src/Error/Error.php

@@ -142,7 +142,7 @@ class Error extends \Exception
         }
 
         if ($this->name) {
-            if (\is_string($this->name) || (\is_object($this->name) && method_exists($this->name, '__toString'))) {
+            if (\is_string($this->name) || $this->name instanceof \Stringable) {
                 $name = \sprintf('"%s"', $this->name);
             } else {
                 $name = json_encode($this->name);

src/Extension/CoreExtension.php

@@ -1191,7 +1191,7 @@ final class CoreExtension extends AbstractExtension
             return iterator_count($thing);
         }
 
-        if (method_exists($thing, '__toString')) {
+        if ($thing instanceof \Stringable) {
             return mb_strlen((string) $thing, $charset);
         }
 
@@ -1328,7 +1328,7 @@ final class CoreExtension extends AbstractExtension
             return !iterator_count($value);
         }
 
-        if (\is_object($value) && method_exists($value, '__toString')) {
+        if ($value instanceof \Stringable) {
             return '' === (string) $value;
         }
 

src/Extension/SandboxExtension.php

@@ -119,7 +119,7 @@ final class SandboxExtension extends AbstractExtension
 
     public function ensureToStringAllowed($obj, int $lineno = -1, ?Source $source = null)
     {
-        if ($this->isSandboxed($source) && \is_object($obj) && method_exists($obj, '__toString')) {
+        if ($this->isSandboxed($source) && $obj instanceof \Stringable) {
             try {
                 $this->policy->checkMethodAllowed($obj, '__toString');
             } catch (SecurityNotAllowedMethodError $e) {

src/Extension/StringLoaderExtension.php

@@ -29,12 +29,11 @@ final class StringLoaderExtension extends AbstractExtension
      *
      *     {{ include(template_from_string("Hello {{ name }}")) }}
      *
-     * @param string      $template A template as a string or object implementing __toString()
-     * @param string|null $name     An optional name of the template to be used in error messages
+     * @param string|null $name An optional name of the template to be used in error messages
      *
      * @internal
      */
-    public static function templateFromString(Environment $env, $template, ?string $name = null): TemplateWrapper
+    public static function templateFromString(Environment $env, string|\Stringable $template, ?string $name = null): TemplateWrapper
     {
         return $env->createTemplate((string) $template, $name);
     }

src/Markup.php

@@ -16,7 +16,7 @@ namespace Twig;
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
-class Markup implements \Countable, \JsonSerializable
+class Markup implements \Countable, \JsonSerializable, \Stringable
 {
     private $content;
     private $charset;

src/Runtime/EscaperRuntime.php

@@ -93,7 +93,7 @@ final class EscaperRuntime implements RuntimeExtensionInterface
         }
 
         if (!\is_string($string)) {
-            if (\is_object($string) && method_exists($string, '__toString')) {
+            if ($string instanceof \Stringable) {
                 if ($autoescape) {
                     $c = \get_class($string);
                     if (!isset($this->safeClasses[$c])) {