strict type fixes

src/Caching/Cache.php

@@ -211,7 +211,7 @@ private function completeDependencies($dp)
 		// convert FILES into CALLBACKS
 		if (isset($dp[self::FILES])) {
 			foreach (array_unique((array) $dp[self::FILES]) as $item) {
-				$dp[self::CALLBACKS][] = [[__CLASS__, 'checkFile'], $item, @filemtime($item)]; // @ - stat may fail
+				$dp[self::CALLBACKS][] = [[__CLASS__, 'checkFile'], $item, @filemtime($item) ?: NULL]; // @ - stat may fail
 			}
 			unset($dp[self::FILES]);
 		}
@@ -325,7 +325,7 @@ public function start($key)
 	 */
 	protected function generateKey($key)
 	{
-		return $this->namespace . md5(is_scalar($key) ? $key : serialize($key));
+		return $this->namespace . md5(is_scalar($key) ? (string) $key : serialize($key));
 	}
 
 

src/Caching/Storages/SQLiteJournal.php

@@ -95,8 +95,6 @@ public function write($key, array $dependencies)
 		}
 
 		$this->pdo->exec('COMMIT');
-
-		return TRUE;
 	}
 
 

tests/Storages/FileStorage.sliding.phpt

@@ -25,7 +25,7 @@ $cache->save($key, $value, [
 ]);
 
 
-for ($i = 0; $i < 5; $i++) {
+for ($i = '0'; $i < '5'; $i++) {
 	// Sleeping 1 second
 	sleep(1);
 	clearstatcache();

tests/Storages/FileStorage.stress.phpt

@@ -1,7 +1,7 @@
 <?php
 
 /**
- * Test: Nette\Caching\Storages\FileStorage sliding expiration test.
+ * Test: Nette\Caching\Storages\FileStorage atomicity test.
  * @multiple   5
  */
 
@@ -36,25 +36,25 @@ $storage = new FileStorage(TEMP_DIR);
 
 // clear playground
 for ($i = 0; $i <= COUNT_FILES; $i++) {
-	$storage->write($i, randomStr(), []);
+	$storage->write((string) $i, randomStr(), []);
 }
 
 
 // test loop
 $hits = ['ok' => 0, 'notfound' => 0, 'error' => 0, 'cantwrite' => 0, 'cantdelete' => 0];
 for ($counter = 0; $counter < 1000; $counter++) {
 	// write
-	$ok = $storage->write(rand(0, COUNT_FILES), randomStr(), []);
+	$ok = $storage->write((string) rand(0, COUNT_FILES), randomStr(), []);
 	if ($ok === FALSE) {
 		$hits['cantwrite']++;
 	}
 
 	// remove
-	//$ok = $storage->remove(rand(0, COUNT_FILES));
+	//$ok = $storage->remove((string) rand(0, COUNT_FILES));
 	//if (!$ok) $hits['cantdelete']++;
 
 	// read
-	$res = $storage->read(rand(0, COUNT_FILES));
+	$res = $storage->read((string) rand(0, COUNT_FILES));
 
 	// compare
 	if ($res === NULL) {