diff --git a/.github/patch-types.php b/.github/patch-types.php
new file mode 100644
index 0000000000000..56a1cb4b1b129
--- /dev/null
+++ b/.github/patch-types.php
@@ -0,0 +1,33 @@
+<?php
+
+$prefix = 'Symfony\\';
+putenv('SYMFONY_PATCH_TYPE_DECLARATIONS=force=1&php71-compat=0&class-prefix='.$prefix);
+
+require __DIR__.'/../.phpunit/phpunit-8.3-0/vendor/autoload.php';
+
+$loader = require __DIR__.'/../vendor/autoload.php';
+
+Symfony\Component\ErrorHandler\DebugClassLoader::enable();
+
+foreach ($loader->getClassMap() as $class => $file) {
+    switch (true) {
+        case 0 !== strpos($class, $prefix):
+        case 0 === strpos($class, 'Symfony\Polyfill\\'):
+        case 0 === strpos($class, 'Symfony\Component\Security\Acl\\'):
+        case false !== strpos($file, '/symfony/phpunit-bridge/'):
+        case false !== strpos($file, '/src/Symfony/Bridge/PhpUnit/'):
+        case false !== strpos($file, '/src/Symfony/Bundle/FrameworkBundle/Tests/Fixtures/Validation/Article.php'):
+        case false !== strpos($file, '/src/Symfony/Component/Config/Tests/Fixtures/BadParent.php'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Compiler/OptionalServiceClass.php'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/ParentNotExists.php'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/Prototype/BadClasses/MissingParent.php'):
+        case false !== strpos($file, '/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/'):
+        case false !== strpos($file, '/src/Symfony/Component/VarDumper/Tests/Fixtures/NotLoadableClass.php'):
+            continue 2;
+    }
+
+    class_exists($class);
+}
+
+Symfony\Component\ErrorHandler\DebugClassLoader::disable();
+
diff --git a/.travis.yml b/.travis.yml
index 184398c68f5aa..8d5ca7e09f6ae 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,12 +25,7 @@ env:
 
 matrix:
     include:
-        - php: 7.1
-          env: php_extra="7.2"
-        - php: 7.3
-          env: deps=high
         - php: 7.4snapshot
-          env: deps=low
     fast_finish: true
 
 cache:
@@ -75,14 +70,12 @@ before_install:
       cp .composer/* ~/.composer/
       export PHPUNIT=$(readlink -f ./phpunit)
       export PHPUNIT_X="$PHPUNIT --exclude-group tty,benchmark,intl-data"
-      export COMPOSER_UP='composer update --no-progress --no-suggest --ansi'
+      export COMPOSER_UP='composer update --no-progress --no-suggest --ansi --optimize-autoloader'
       export COMPONENTS=$(find src/Symfony -mindepth 2 -type f -name phpunit.xml.dist -printf '%h\n')
       find ~/.phpenv -name xdebug.ini -delete
 
-      if [[ $TRAVIS_PHP_VERSION = 7.4* && $deps ]]; then
+      if [[ $TRAVIS_PHP_VERSION = 7.4* ]]; then
           export PHPUNIT_X="$PHPUNIT_X,issue-32995"
-      elif [[ $TRAVIS_PHP_VERSION = 7.4* ]]; then
-          export PHPUNIT_X="$PHPUNIT --group issue-32995"
       fi
 
       nanoseconds () {
@@ -163,6 +156,7 @@ before_install:
     - |
       # Install extra PHP extensions
       for PHP in $TRAVIS_PHP_VERSION $php_extra; do
+          continue
           export PHP=$PHP
           phpenv global $PHP
           INI=~/.phpenv/versions/$PHP/etc/conf.d/travis.ini
@@ -270,6 +264,9 @@ install:
           ([[ $deps ]] && cd src/Symfony/Component/HttpFoundation; composer config platform.ext-mongodb 1.6.0; composer require --dev --no-update mongodb/mongodb)
           tfold 'composer update' $COMPOSER_UP
           tfold 'phpunit install' ./phpunit install
+
+          php .github/patch-types.php
+
           if [[ $deps = high ]]; then
               echo "$COMPONENTS" | parallel --gnu "tfold {} 'cd {} && $COMPOSER_UP && $PHPUNIT_X$LEGACY'"
           elif [[ $deps = low ]]; then
diff --git a/composer.json b/composer.json
index 93d6b029d8c12..1350051ca76b5 100644
--- a/composer.json
+++ b/composer.json
@@ -142,11 +142,13 @@
             "src/Symfony/Bridge/ProxyManager/Legacy/ProxiedMethodReturnExpression.php"
         ],
         "exclude-from-classmap": [
-            "**/Tests/"
         ]
     },
     "autoload-dev": {
-        "files": [ "src/Symfony/Component/VarDumper/Resources/functions/dump.php" ]
+        "files": [
+            "src/Symfony/Component/Debug/Exception/FlattenException.php",
+            "src/Symfony/Component/VarDumper/Resources/functions/dump.php"
+        ]
     },
     "repositories": [
         {
diff --git a/src/Symfony/Component/ErrorHandler/DebugClassLoader.php b/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
index 9bf8ce13874c7..f0ecd3c58f93c 100644
--- a/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
+++ b/src/Symfony/Component/ErrorHandler/DebugClassLoader.php
@@ -423,7 +423,8 @@ public function checkAnnotations(\ReflectionClass $refl, string $class): array
             }
 
             if ($canAddReturnType = '' !== ($this->patchTypes['class-prefix'] ?? '') && 0 === strpos($class, $this->patchTypes['class-prefix'])) {
-                $canAddReturnType = false !== strpos($refl->getFileName(), \DIRECTORY_SEPARATOR.'Tests'.\DIRECTORY_SEPARATOR)
+                $canAddReturnType = ($this->patchTypes['force'] ?? false)
+                    || false !== strpos($refl->getFileName(), \DIRECTORY_SEPARATOR.'Tests'.\DIRECTORY_SEPARATOR)
                     || $refl->isFinal()
                     || $method->isFinal()
                     || $method->isPrivate()
@@ -777,7 +778,7 @@ private function patchMethod(\ReflectionMethod $method, string $returnType, stri
             }
         }
 
-        if ('object' === $normalizedType && ($this->patchTypes['keep-compat-with-php71'] ?? false)) {
+        if ('object' === $normalizedType && ($this->patchTypes['php71-compat'] ?? false)) {
             $returnType = implode('|', $returnType);
 
             if ($method->getDocComment()) {
@@ -845,7 +846,7 @@ private static function getUseStatements(string $file): array
 
     private function fixReturnStatements(\ReflectionMethod $method, ?string $returnType, int $i = 0)
     {
-        if (($this->patchTypes['keep-compat-with-php71'] ?? false) && 'object' === ltrim($returnType, '?')) {
+        if (($this->patchTypes['php71-compat'] ?? false) && 'object' === ltrim($returnType, '?')) {
             return;
         }