diff --git a/Process.php b/Process.php
index 60bd2039..f31e5735 100644
--- a/Process.php
+++ b/Process.php
@@ -340,7 +340,7 @@ public function start(callable $callback = null, array $env = [])
 
         $envPairs = [];
         foreach ($env as $k => $v) {
-            if (false !== $v) {
+            if (false !== $v && 'argc' !== $k && 'argv' !== $k) {
                 $envPairs[] = $k.'='.$v;
             }
         }
@@ -1143,25 +1143,12 @@ public function getEnv()
     /**
      * Sets the environment variables.
      *
-     * Each environment variable value should be a string.
-     * If it is an array, the variable is ignored.
-     * If it is false or null, it will be removed when
-     * env vars are otherwise inherited.
-     *
-     * That happens in PHP when 'argv' is registered into
-     * the $_ENV array for instance.
-     *
-     * @param array $env The new environment variables
+     * @param array<string|\Stringable> $env The new environment variables
      *
      * @return $this
      */
     public function setEnv(array $env)
     {
-        // Process cannot handle env values that are arrays
-        $env = array_filter($env, function ($value) {
-            return !\is_array($value);
-        });
-
         $this->env = $env;
 
         return $this;
@@ -1664,12 +1651,6 @@ private function getDefaultEnv(): array
         $env = getenv();
         $env = array_intersect_key($env, $_SERVER) ?: $env;
 
-        foreach ($_ENV as $k => $v) {
-            if (\is_string($v)) {
-                $env[$k] = $v;
-            }
-        }
-
-        return $env;
+        return $_ENV + $env;
     }
 }
diff --git a/README.md b/README.md
index afce5e45..8777de4a 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,17 @@ Process Component
 
 The Process component executes commands in sub-processes.
 
+Sponsor
+-------
+
+The Process component for Symfony 5.4/6.0 is [backed][1] by [SensioLabs][2].
+
+As the creator of Symfony, SensioLabs supports companies using Symfony, with an
+offering encompassing consultancy, expertise, services, training, and technical
+assistance to ensure the success of web application development projects.
+
+Help Symfony by [sponsoring][3] its development!
+
 Resources
 ---------
 
@@ -11,3 +22,7 @@ Resources
  * [Report issues](https://github.com/symfony/symfony/issues) and
    [send Pull Requests](https://github.com/symfony/symfony/pulls)
    in the [main Symfony repository](https://github.com/symfony/symfony)
+
+[1]: https://symfony.com/backers
+[2]: https://sensiolabs.com
+[3]: https://symfony.com/sponsor