Improves static analysis

Author: GromNaN

psalm-baseline.xml

@@ -284,9 +284,18 @@
     </MixedArgumentTypeCoercion>
   </file>
   <file src="src/GridFS/CollectionWrapper.php">
+    <InvalidNullableReturnType>
+      <code><![CDATA[int]]></code>
+    </InvalidNullableReturnType>
     <MixedAssignment>
       <code><![CDATA[$ids[]]]></code>
     </MixedAssignment>
+    <NullableReturnStatement>
+      <code><![CDATA[$this->filesCollection->updateMany(
+            ['filename' => $filename],
+            ['$set' => ['filename' => $newFilename]],
+        )->getMatchedCount()]]></code>
+    </NullableReturnStatement>
   </file>
   <file src="src/GridFS/ReadableStream.php">
     <MixedArgument>

src/GridFS/CollectionWrapper.php

@@ -150,9 +150,6 @@ public function findChunksByFileId(mixed $id, int $fromChunk = 0)
      */
     public function findFileByFilenameAndRevision(string $filename, int $revision): ?object
     {
-        $filename = $filename;
-        $revision = $revision;
-
         if ($revision < 0) {
             $skip = abs($revision) - 1;
             $sortOrder = -1;
@@ -266,7 +263,7 @@ public function insertFile(array|object $file): void
     /**
      * Updates the filename field in the file document for all the files with a given filename.
      */
-    public function updateFilenameForFilename(string $filename, string $newFilename): ?int
+    public function updateFilenameForFilename(string $filename, string $newFilename): int
     {
         return $this->filesCollection->updateMany(
             ['filename' => $filename],