added feedback from @nunomaduro

src/Support/ExceptionTrace.php

@@ -18,10 +18,10 @@ final class ExceptionTrace
      * Ensures the given closure reports
      * the good execution context.
      */
-    public static function ensure(Closure $closure): Mixed
+    public static function ensure(Closure $closure)
     {
         try {
-            return new Mixed($closure());
+            return $closure();
         } catch (Throwable $throwable) {
             if (Str::startsWith($message = $throwable->getMessage(), self::UNDEFINED_METHOD)) {
                 $message = str_replace(self::UNDEFINED_METHOD, 'Call to undefined method ', $message);

src/Support/Mixed.php

@@ -1,32 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Pest\Support;
-
-/**
- * @internal
- */
-final class Mixed
-{
-    /**
-     * @var mixed
-     */
-    private $value;
-
-    /**
-     * @param mixed $value
-     */
-    public function __construct($value)
-    {
-        $this->value = $value;
-    }
-
-    /**
-     * @return mixed
-     */
-    public function getValue()
-    {
-        return $this->value;
-    }
-}