diff --git a/lib/private/Files/Storage/Common.php b/lib/private/Files/Storage/Common.php
index 737c1e9d51e31..3473eebc4a0e1 100644
--- a/lib/private/Files/Storage/Common.php
+++ b/lib/private/Files/Storage/Common.php
@@ -477,7 +477,7 @@ public function test() {
 	 * get the free space in the storage
 	 *
 	 * @param string $path
-	 * @return int|false
+	 * @return int|float|false
 	 */
 	public function free_space($path) {
 		return \OCP\Files\FileInfo::SPACE_UNKNOWN;
diff --git a/lib/private/Files/Storage/DAV.php b/lib/private/Files/Storage/DAV.php
index fcb07cb9748da..0c4a81b7491bc 100644
--- a/lib/private/Files/Storage/DAV.php
+++ b/lib/private/Files/Storage/DAV.php
@@ -486,7 +486,7 @@ public function touch($path, $mtime = null) {
 	/**
 	 * @param string $path
 	 * @param mixed $data
-	 * @return int|false
+	 * @return int|float|false
 	 */
 	public function file_put_contents($path, $data) {
 		$path = $this->cleanPath($path);
diff --git a/lib/private/Files/Storage/Local.php b/lib/private/Files/Storage/Local.php
index fe6a6d6e21ad5..1ff733e0d9251 100644
--- a/lib/private/Files/Storage/Local.php
+++ b/lib/private/Files/Storage/Local.php
@@ -249,7 +249,7 @@ public function filesize($path): false|int|float {
 		$fullPath = $this->getSourcePath($path);
 		if (PHP_INT_SIZE === 4) {
 			$helper = new \OC\LargeFileHelper;
-			return $helper->getFileSize($fullPath) ?? false;
+			return $helper->getFileSize($fullPath);
 		}
 		return filesize($fullPath);
 	}
@@ -617,6 +617,7 @@ public function moveFromStorage(IStorage $sourceStorage, $sourceInternalPath, $t
 	}
 
 	public function writeStream(string $path, $stream, int $size = null): int {
+		/** @var int|false $result We consider here that returned size will never be a float because we write less than 4GB */
 		$result = $this->file_put_contents($path, $stream);
 		if (is_resource($stream)) {
 			fclose($stream);
diff --git a/lib/private/Files/Storage/Wrapper/Encoding.php b/lib/private/Files/Storage/Wrapper/Encoding.php
index 6aba839d26d4d..d6006f746ad4e 100644
--- a/lib/private/Files/Storage/Wrapper/Encoding.php
+++ b/lib/private/Files/Storage/Wrapper/Encoding.php
@@ -311,7 +311,7 @@ public function file_get_contents($path) {
 	 *
 	 * @param string $path
 	 * @param mixed $data
-	 * @return int|false
+	 * @return int|float|false
 	 */
 	public function file_put_contents($path, $data) {
 		return $this->storage->file_put_contents($this->findPathToUse($path), $data);
@@ -396,7 +396,7 @@ public function hash($type, $path, $raw = false) {
 	 * see https://www.php.net/manual/en/function.free_space.php
 	 *
 	 * @param string $path
-	 * @return int|bool
+	 * @return int|float|bool
 	 */
 	public function free_space($path) {
 		return $this->storage->free_space($this->findPathToUse($path));
diff --git a/lib/private/Files/Storage/Wrapper/Jail.php b/lib/private/Files/Storage/Wrapper/Jail.php
index 4501c96d63146..e21a2cba244a8 100644
--- a/lib/private/Files/Storage/Wrapper/Jail.php
+++ b/lib/private/Files/Storage/Wrapper/Jail.php
@@ -259,7 +259,7 @@ public function file_get_contents($path) {
 	 *
 	 * @param string $path
 	 * @param mixed $data
-	 * @return int|false
+	 * @return int|float|false
 	 */
 	public function file_put_contents($path, $data) {
 		return $this->getWrapperStorage()->file_put_contents($this->getUnjailedPath($path), $data);
@@ -335,7 +335,7 @@ public function hash($type, $path, $raw = false) {
 	 * see https://www.php.net/manual/en/function.free_space.php
 	 *
 	 * @param string $path
-	 * @return int|bool
+	 * @return int|float|bool
 	 */
 	public function free_space($path) {
 		return $this->getWrapperStorage()->free_space($this->getUnjailedPath($path));
diff --git a/lib/private/Files/Storage/Wrapper/Quota.php b/lib/private/Files/Storage/Wrapper/Quota.php
index 5c542361c3663..cfb2c455a2ce8 100644
--- a/lib/private/Files/Storage/Wrapper/Quota.php
+++ b/lib/private/Files/Storage/Wrapper/Quota.php
@@ -41,7 +41,8 @@
 class Quota extends Wrapper {
 	/** @var callable|null */
 	protected $quotaCallback;
-	protected ?int $quota;
+	/** @var int|float|null int on 64bits, float on 32bits for bigint */
+	protected int|float|null $quota;
 	protected string $sizeRoot;
 	private SystemConfig $config;
 
@@ -57,9 +58,9 @@ public function __construct($parameters) {
 	}
 
 	/**
-	 * @return int quota value
+	 * @return int|float quota value
 	 */
-	public function getQuota(): int {
+	public function getQuota(): int|float {
 		if ($this->quota === null) {
 			$quotaCallback = $this->quotaCallback;
 			if ($quotaCallback === null) {
@@ -77,7 +78,8 @@ private function hasQuota(): bool {
 
 	/**
 	 * @param string $path
-	 * @param \OC\Files\Storage\Storage $storage
+	 * @param IStorage $storage
+	 * @return int|float
 	 */
 	protected function getSize($path, $storage = null) {
 		if ($this->config->getValue('quota_include_external_storage', false)) {
@@ -101,7 +103,7 @@ protected function getSize($path, $storage = null) {
 	 * Get free space as limited by the quota
 	 *
 	 * @param string $path
-	 * @return int|bool
+	 * @return int|float|bool
 	 */
 	public function free_space($path) {
 		if (!$this->hasQuota()) {
@@ -128,7 +130,7 @@ public function free_space($path) {
 	 *
 	 * @param string $path
 	 * @param mixed $data
-	 * @return int|false
+	 * @return int|float|false
 	 */
 	public function file_put_contents($path, $data) {
 		if (!$this->hasQuota()) {
@@ -177,7 +179,7 @@ public function fopen($path, $mode) {
 		// don't apply quota for part files
 		if (!$this->isPartFile($path)) {
 			$free = $this->free_space($path);
-			if ($source && is_int($free) && $free >= 0 && $mode !== 'r' && $mode !== 'rb') {
+			if ($source && (is_int($free) || is_float($free)) && $free >= 0 && $mode !== 'r' && $mode !== 'rb') {
 				// only apply quota for files, not metadata, trash or others
 				if ($this->shouldApplyQuota($path)) {
 					return \OC\Files\Stream\Quota::wrap($source, $free);
@@ -192,7 +194,7 @@ public function fopen($path, $mode) {
 	 * Checks whether the given path is a part file
 	 *
 	 * @param string $path Path that may identify a .part file
-	 * @return string File path without .part extension
+	 * @return bool
 	 * @note this is needed for reusing keys
 	 */
 	private function isPartFile($path) {
diff --git a/lib/private/Files/Storage/Wrapper/Wrapper.php b/lib/private/Files/Storage/Wrapper/Wrapper.php
index 26b4570cc7542..c2d382f5dfc52 100644
--- a/lib/private/Files/Storage/Wrapper/Wrapper.php
+++ b/lib/private/Files/Storage/Wrapper/Wrapper.php
@@ -249,7 +249,7 @@ public function file_get_contents($path) {
 	 *
 	 * @param string $path
 	 * @param mixed $data
-	 * @return int|false
+	 * @return int|float|false
 	 */
 	public function file_put_contents($path, $data) {
 		return $this->getWrapperStorage()->file_put_contents($path, $data);
@@ -325,7 +325,7 @@ public function hash($type, $path, $raw = false) {
 	 * see https://www.php.net/manual/en/function.free_space.php
 	 *
 	 * @param string $path
-	 * @return int|bool
+	 * @return int|float|bool
 	 */
 	public function free_space($path) {
 		return $this->getWrapperStorage()->free_space($path);
diff --git a/lib/private/LargeFileHelper.php b/lib/private/LargeFileHelper.php
index 2b2fed4e9f126..c8d6ba42eb5fd 100755
--- a/lib/private/LargeFileHelper.php
+++ b/lib/private/LargeFileHelper.php
@@ -95,10 +95,9 @@ public function formatUnsignedInteger(int|float|string $number): string {
 	 *
 	 * @param string $filename Path to the file.
 	 *
-	 * @return null|int|float Number of bytes as number (float or int) or
-	 *                        null on failure.
+	 * @return int|float Number of bytes as number (float or int)
 	 */
-	public function getFileSize(string $filename): null|int|float {
+	public function getFileSize(string $filename): int|float {
 		$fileSize = $this->getFileSizeViaCurl($filename);
 		if (!is_null($fileSize)) {
 			return $fileSize;
diff --git a/lib/public/Files/Storage.php b/lib/public/Files/Storage.php
index ca5276af1e8fb..c91d47bdcdfec 100644
--- a/lib/public/Files/Storage.php
+++ b/lib/public/Files/Storage.php
@@ -227,7 +227,7 @@ public function file_get_contents($path);
 	 *
 	 * @param string $path
 	 * @param mixed $data
-	 * @return int|false
+	 * @return int|float|false
 	 * @since 6.0.0
 	 */
 	public function file_put_contents($path, $data);
@@ -296,7 +296,7 @@ public function hash($type, $path, $raw = false);
 	 * see https://www.php.net/manual/en/function.disk-free-space.php
 	 *
 	 * @param string $path
-	 * @return int|bool
+	 * @return int|float|bool
 	 * @since 6.0.0
 	 */
 	public function free_space($path);
diff --git a/lib/public/Files/Storage/IStorage.php b/lib/public/Files/Storage/IStorage.php
index 1084eb7c94183..7b3b9eb484e82 100644
--- a/lib/public/Files/Storage/IStorage.php
+++ b/lib/public/Files/Storage/IStorage.php
@@ -224,7 +224,7 @@ public function file_get_contents($path);
 	 *
 	 * @param string $path
 	 * @param mixed $data
-	 * @return int|false
+	 * @return int|float|false
 	 * @since 9.0.0
 	 */
 	public function file_put_contents($path, $data);
@@ -293,7 +293,7 @@ public function hash($type, $path, $raw = false);
 	 * see https://www.php.net/manual/en/function.free_space.php
 	 *
 	 * @param string $path
-	 * @return int|bool
+	 * @return int|float|bool
 	 * @since 9.0.0
 	 */
 	public function free_space($path);