Optimize: use O(1) item lookup instead of O(M) in a loop.

 When checking $includedFiles for an included file,
 the previous `in_array()` approach, executed in a loop,
 is very expensive. Basically, it results in performance
 of O(N * M), where N - number of declared classes,
 M - number of included classes. The current approach
 is O(N), since `isset()` check has constant `O(1)` time.

Author: rela589n

src/Persistence/Mapping/Driver/ColocatedMappingDriver.php

@@ -19,7 +19,6 @@
 use function array_unique;
 use function assert;
 use function get_declared_classes;
-use function in_array;
 use function is_dir;
 use function preg_match;
 use function preg_quote;
@@ -165,7 +164,8 @@ public function getAllClassNames(): array
             $this->sourceFilePathNames ?? [],
             $this->pathNameIterator($filesIterator),
         );
-        $includedFiles       = [];
+        /** @var array<string,true> $includedFiles */
+        $includedFiles = [];
 
         foreach ($sourceFilePathNames as $sourceFile) {
             if (preg_match('(^phar:)i', $sourceFile) === 0) {
@@ -186,7 +186,7 @@ public function getAllClassNames(): array
 
             require_once $sourceFile;
 
-            $includedFiles[] = $sourceFile;
+            $includedFiles[$sourceFile] = true;
         }
 
         $classes  = [];
@@ -197,7 +197,7 @@ public function getAllClassNames(): array
 
             $sourceFile = $rc->getFileName();
 
-            if (! in_array($sourceFile, $includedFiles, true) || $this->isTransient($className)) {
+            if (! isset($includedFiles[$sourceFile]) || $this->isTransient($className)) {
                 continue;
             }