cache_lifetime must be an integer or null (#417)

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 The change log describes what is "Added", "Removed", "Changed" or "Fixed" between each release.
 
+# 1.xx.yy- YYYY-MM-JJ
+
+- Fixed: You can now configure the cache plugin option `cache_lifetime` to `null` (which makes the plugin not add to the maxAge).
+
 # 1.26.1 - 2022-04-29
 
 - Fixed: Setting the cache plugin option `respect_response_cache_directives` to `null` makes the

src/DependencyInjection/Configuration.php

@@ -710,8 +710,14 @@ private function createCachePluginNode()
                 ->scalarNode('cache_key_generator')
                     ->info('This must be a service id to a service implementing '.CacheKeyGenerator::class)
                 ->end()
-                ->integerNode('cache_lifetime')
+                ->scalarNode('cache_lifetime')
                     ->info('The minimum time we should store a cache item')
+                    ->validate()
+                    ->ifTrue(function ($v) {
+                        return null !== $v && !is_int($v);
+                    })
+                    ->thenInvalid('cache_lifetime must be an integer or null, got %s')
+                    ->end()
                 ->end()
                 ->scalarNode('default_ttl')
                     ->info('The default max age of a Response')