diff --git a/src/Pattern/CallbackCache.php b/src/Pattern/CallbackCache.php
index c2c51418..2160cfe4 100644
--- a/src/Pattern/CallbackCache.php
+++ b/src/Pattern/CallbackCache.php
@@ -48,7 +48,7 @@ public function call($callback, array $args = [])
         $cacheOutput = $options->getCacheOutput();
         if ($cacheOutput) {
             ob_start();
-            ob_implicit_flush(0);
+            ob_implicit_flush(false);
         }
 
         // TODO: do not cache on errors using [set|restore]_error_handler
diff --git a/src/Pattern/CaptureCache.php b/src/Pattern/CaptureCache.php
index f4b275e1..add05c48 100644
--- a/src/Pattern/CaptureCache.php
+++ b/src/Pattern/CaptureCache.php
@@ -48,7 +48,7 @@ public function start($pageId = null)
             return false;
         });
 
-        ob_implicit_flush(0);
+        ob_implicit_flush(false);
     }
 
     /**
diff --git a/src/Pattern/OutputCache.php b/src/Pattern/OutputCache.php
index 8f69671d..68b98111 100644
--- a/src/Pattern/OutputCache.php
+++ b/src/Pattern/OutputCache.php
@@ -41,7 +41,7 @@ public function start($key)
         }
 
         ob_start();
-        ob_implicit_flush(0);
+        ob_implicit_flush(false);
         $this->keyStack[] = $key;
         return false;
     }
diff --git a/src/Psr/CacheItemPool/CacheItem.php b/src/Psr/CacheItemPool/CacheItem.php
index 65f5cd0f..9992151e 100644
--- a/src/Psr/CacheItemPool/CacheItem.php
+++ b/src/Psr/CacheItemPool/CacheItem.php
@@ -145,7 +145,7 @@ public function expiresAfter($time): static
             $time = $interval;
         }
 
-        /** @psalm-suppress RedundantConditionGivenDocblockType Until we do have native type-hints we should keep verifying this. */
+        /** @psalm-suppress RedundantCondition Until we do have native type-hints we should keep verifying this. */
         if ($time instanceof DateInterval) {
             $now = $this->clock->now();
             return $this->expiresAt($now->add($time));
diff --git a/test/Pattern/CallbackCacheTest.php b/test/Pattern/CallbackCacheTest.php
index 56b2d9bf..b7fe6852 100644
--- a/test/Pattern/CallbackCacheTest.php
+++ b/test/Pattern/CallbackCacheTest.php
@@ -117,7 +117,7 @@ protected function executeCallbackAndMakeAssertions($callback, array $args): voi
         $firstCounter = TestCallbackCache::$fooCounter + 1;
 
         ob_start();
-        ob_implicit_flush(0);
+        ob_implicit_flush(false);
         $return = $this->pattern->call($callback, $args);
         $data   = ob_get_clean();
 
@@ -126,7 +126,7 @@ protected function executeCallbackAndMakeAssertions($callback, array $args): voi
 
         // second call - cached
         ob_start();
-        ob_implicit_flush(0);
+        ob_implicit_flush(false);
         $return = $this->pattern->call($callback, $args);
         $data   = ob_get_clean();
 
diff --git a/test/Pattern/ObjectCacheTest.php b/test/Pattern/ObjectCacheTest.php
index 179291c3..ce90be98 100644
--- a/test/Pattern/ObjectCacheTest.php
+++ b/test/Pattern/ObjectCacheTest.php
@@ -130,7 +130,7 @@ protected function executeMethodAndMakeAssertions(string $method, array $args):
         $firstCounter = TestObjectCache::$fooCounter + 1;
 
         ob_start();
-        ob_implicit_flush(0);
+        ob_implicit_flush(false);
         $return = $callback(...$args);
         $data   = ob_get_contents();
         ob_end_clean();
@@ -140,7 +140,7 @@ protected function executeMethodAndMakeAssertions(string $method, array $args):
 
         // second call - cached
         ob_start();
-        ob_implicit_flush(0);
+        ob_implicit_flush(false);
         $return = $callback(...$args);
         $data   = ob_get_contents();
         ob_end_clean();
diff --git a/test/Psr/CacheItemPool/CacheItemPoolDecoratorTest.php b/test/Psr/CacheItemPool/CacheItemPoolDecoratorTest.php
index 0e9da74d..c73e08ea 100644
--- a/test/Psr/CacheItemPool/CacheItemPoolDecoratorTest.php
+++ b/test/Psr/CacheItemPool/CacheItemPoolDecoratorTest.php
@@ -222,7 +222,10 @@ public function testGetNonexistentItems(): void
             ->willReturn([]);
 
         $adapter = $this->getAdapter($storage);
-        $items   = $adapter->getItems($keys);
+        /**
+         * @var array<string, CacheItem> $items
+         */
+        $items = $adapter->getItems($keys);
         self::assertEquals($keys, array_keys($items));
         foreach ($keys as $key) {
             self::assertEquals($key, $items[$key]->getKey());
@@ -268,6 +271,9 @@ public function testGetMixedItems(): void
             ->with($keys)
             ->willReturn(['bar' => 'value']);
 
+        /**
+         * @var array<string, CacheItem> $items
+         */
         $items = $this->getAdapter($storage)->getItems($keys);
         self::assertCount(2, $items);
         self::assertNull($items['foo']->get());
@@ -295,6 +301,9 @@ public function testGetItemsRuntimeExceptionIsMiss(): void
             ->with($keys)
             ->willThrowException(new Exception\RuntimeException());
 
+        /**
+         * @var array<string, CacheItem> $items
+         */
         $items = $this->getAdapter($storage)->getItems($keys);
         self::assertCount(2, $items);
         foreach ($keys as $key) {
@@ -338,6 +347,9 @@ public function testSaveItem(): void
         $item    = $adapter->getItem('foo');
         $item->set('bar');
         self::assertTrue($adapter->save($item));
+        /**
+         * @var array<string, CacheItem> $saved
+         */
         $saved = $adapter->getItems(['foo']);
         self::assertEquals('bar', $saved['foo']->get());
         self::assertTrue($saved['foo']->isHit());
@@ -376,6 +388,9 @@ public function testSaveItemWithExpiration(): void
         $item->set('bar');
         $item->expiresAfter(3600);
         self::assertTrue($adapter->save($item));
+        /**
+         * @var array<string, CacheItem> $saved
+         */
         $saved = $adapter->getItems(['foo']);
         self::assertEquals('bar', $saved['foo']->get());
         self::assertTrue($saved['foo']->isHit());