diff --git a/config/mago-analyze-baseline.toml b/config/mago-analyze-baseline.toml
index b07efd4..0f0e247 100644
--- a/config/mago-analyze-baseline.toml
+++ b/config/mago-analyze-baseline.toml
@@ -36,12 +36,6 @@ code = "mixed-assignment"
 message = "Assigning `mixed` type to a variable may lead to unexpected behavior."
 count = 4
 
-[[issues]]
-file = "src/Command/InfoCommand.php"
-code = "invalid-array-index"
-message = "Invalid index type `int` used for array access on `string('kMGTPE')`."
-count = 1
-
 [[issues]]
 file = "src/Command/InfoCommand.php"
 code = "invalid-array-index"
@@ -60,12 +54,6 @@ code = "mixed-argument"
 message = 'Invalid argument type for argument #1 of `Cloudinary\Api\Admin\AssetsTrait::asset`: expected `string`, but found `mixed`.'
 count = 1
 
-[[issues]]
-file = "src/Command/InfoCommand.php"
-code = "possibly-invalid-operand"
-message = "Possibly invalid type for right operand."
-count = 1
-
 [[issues]]
 file = "src/Command/UploadCommand.php"
 code = "invalid-array-index"
diff --git a/config/mago-lint-baseline.toml b/config/mago-lint-baseline.toml
index 506cf5a..2f0900c 100644
--- a/config/mago-lint-baseline.toml
+++ b/config/mago-lint-baseline.toml
@@ -1,13 +1,13 @@
 variant = "loose"
 
-[[issues]]
-file = "src/Command/InfoCommand.php"
-code = "psl-math-functions"
-message = "Use the Psl math function instead of the PHP counterpart."
-count = 2
-
 [[issues]]
 file = "src/Factory/CloudinaryFactory.php"
 code = "no-isset"
 message = "Use of the `isset` construct."
 count = 1
+
+[[issues]]
+file = "src/Factory/CloudinaryFactory.php"
+code = "psl-array-functions"
+message = "Use the Psl array function instead of the PHP counterpart."
+count = 5
diff --git a/config/mago.toml b/config/mago.toml
index b0b5797..eacd3f4 100644
--- a/config/mago.toml
+++ b/config/mago.toml
@@ -30,9 +30,7 @@ interface-name = { enabled = false }
 trait-name = { enabled = false }
 yoda-conditions = { enabled = false }
 assertion-style = { style = "self" }
-psl-array-functions = { enabled = false }
 psl-datetime = { enabled = false }
-psl-string-functions = { enabled = false }
 
 [analyzer]
 plugins = ["psl"]
diff --git a/config/phpstan-bootstrap.php b/config/phpstan-bootstrap.php
new file mode 100644
index 0000000..ee8616c
--- /dev/null
+++ b/config/phpstan-bootstrap.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * PSL maps its PSR-4 prefixes onto the directories holding its function files, so asking whether
+ * "Psl\Env\get_var" is a class makes an autoloader include a file which only declares a function.
+ * The class still does not exist, the next autoloader includes the very same file again, and PHP
+ * dies with "Cannot redeclare Psl\Env\get_var()". Since 2.2.13 PHPStan performs such a lookup while
+ * analysing, which kills its worker processes.
+ *
+ * Wrapping every registered autoloader stops the second include: a name which is already a defined
+ * function can not be a class waiting to be autoloaded, so there is nothing left to look for.
+ *
+ * Taken from open-api-generator. Here it happens on PHP 8.3, with PSL 3.3 as well as 4.3, for example
+ * for Psl\Env\get_var() and Psl\File\read(); PHP 8.5 is not affected. Remove this file together with
+ * support for PHP 8.3, or once PHPStan runs on PHP 8.3 without it.
+ */
+
+declare(strict_types=1);
+
+$autoloaders = spl_autoload_functions();
+
+foreach ($autoloaders as $autoloader) {
+    spl_autoload_unregister($autoloader);
+}
+
+foreach ($autoloaders as $autoloader) {
+    spl_autoload_register(
+        static function (string $name) use ($autoloader): void {
+            if (function_exists($name)) {
+                return;
+            }
+
+            $autoloader($name);
+        },
+    );
+}
diff --git a/config/phpstan.neon b/config/phpstan.neon
index 2e42b22..a6fa76b 100644
--- a/config/phpstan.neon
+++ b/config/phpstan.neon
@@ -1,4 +1,6 @@
 parameters:
+    bootstrapFiles:
+        - phpstan-bootstrap.php
     level: max
     paths:
         - ../src
diff --git a/src/Command/InfoCommand.php b/src/Command/InfoCommand.php
index 8eca037..202b497 100644
--- a/src/Command/InfoCommand.php
+++ b/src/Command/InfoCommand.php
@@ -6,6 +6,9 @@
 
 use Cloudinary\Api\ApiResponse;
 use Override;
+use Psl\Iter;
+use Psl\Math;
+use Psl\Str;
 use Speicher210\CloudinaryBundle\Cloudinary\Admin;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Helper\TableCell;
@@ -15,9 +18,6 @@
 use Symfony\Component\Console\Style\SymfonyStyle;
 
 use function is_scalar;
-use function log;
-use function pow;
-use function sprintf;
 
 final class InfoCommand extends Command
 {
@@ -102,15 +102,14 @@ private function renderDerivedResources(SymfonyStyle $symfonyStyle, array $deriv
 
     private function formatSize(int $bytes): string
     {
-        $unit = 1024;
-        if ($bytes <= $unit) {
-            return $bytes . ' b';
+        $units = ['B', 'KiB', 'MiB', 'GiB', 'TiB'];
+        $size  = $bytes;
+        $unit  = 0;
+        while (Math\round($size, 1) >= 1024 && $unit < Iter\count($units) - 1) {
+            $size /= 1024;
+            $unit++;
         }
 
-        $exp = (int) (log($bytes) / log($unit));
-        $pre = 'kMGTPE';
-        $pre = $pre[$exp - 1];
-
-        return sprintf('%.1f %sB', $bytes / pow($unit, $exp), $pre);
+        return $unit === 0 ? $bytes . ' B' : Str\format('%.1f %s', $size, $units[$unit]);
     }
 }
diff --git a/tests/Command/DisplaySnapshots.php b/tests/Command/DisplaySnapshots.php
index a85fc1c..9440bfd 100644
--- a/tests/Command/DisplaySnapshots.php
+++ b/tests/Command/DisplaySnapshots.php
@@ -5,12 +5,10 @@
 namespace Speicher210\CloudinaryBundle\Tests\Command;
 
 use PHPUnit\Framework\Assert;
+use Psl\Env;
+use Psl\File;
 use Psl\Regex;
 
-use function file_get_contents;
-use function file_put_contents;
-use function getenv;
-
 trait DisplaySnapshots
 {
     /**
@@ -22,13 +20,11 @@ private static function assertDisplayMatchesSnapshot(string $snapshot, string $d
     {
         $file = __DIR__ . '/Expected/' . $snapshot . '.txt';
 
-        if (getenv('UPDATE_SNAPSHOTS') === '1') {
-            file_put_contents($file, $display);
+        if (Env\get_var('UPDATE_SNAPSHOTS') === '1') {
+            File\write($file, $display, File\WriteMode::Truncate);
         }
 
-        $expected = file_get_contents($file);
-        Assert::assertIsString($expected, 'Missing snapshot ' . $file);
-        Assert::assertSame(self::normalizeDisplay($expected), self::normalizeDisplay($display));
+        Assert::assertSame(self::normalizeDisplay(File\read($file)), self::normalizeDisplay($display));
     }
 
     /**
diff --git a/tests/Command/Expected/info-verbose.txt b/tests/Command/Expected/info-verbose.txt
index 64e38da..e18ed10 100644
--- a/tests/Command/Expected/info-verbose.txt
+++ b/tests/Command/Expected/info-verbose.txt
@@ -6,12 +6,14 @@
   bytes       2048          
  ----------- -------------- 
 
- ---------------------------------------------------------------------------------------------------------------- 
-  Derived resources                                                                                               
- ------ -------- -------- ---------------- ---------------------------------------------------------------------- 
-  ID     Format   Size     Transformation   URL                                                                   
- ------ -------- -------- ---------------- ---------------------------------------------------------------------- 
-  d1     webp     512 b    w_100            https://res.cloudinary.com/demo/image/upload/w_100/folder/image.webp  
-  d2     avif     2.0 kB   w_200            https://res.cloudinary.com/demo/image/upload/w_200/folder/image.avif  
-  d3     png      1.5 MB   w_2000           https://res.cloudinary.com/demo/image/upload/w_2000/folder/image.png  
- ------ -------- -------- ---------------- ---------------------------------------------------------------------- 
+ ----------------------------------------------------------------------------------------------------------------- 
+  Derived resources                                                                                                
+ ------ -------- --------- ---------------- ---------------------------------------------------------------------- 
+  ID     Format   Size      Transformation   URL                                                                   
+ ------ -------- --------- ---------------- ---------------------------------------------------------------------- 
+  d1     webp     512 B     w_100            https://res.cloudinary.com/demo/image/upload/w_100/folder/image.webp  
+  d2     avif     2.0 KiB   w_200            https://res.cloudinary.com/demo/image/upload/w_200/folder/image.avif  
+  d3     png      1.5 MiB   w_2000           https://res.cloudinary.com/demo/image/upload/w_2000/folder/image.png  
+  d4     gif      1.0 KiB   w_10             https://res.cloudinary.com/demo/image/upload/w_10/folder/image.gif    
+  d5     jpg      1.0 MiB   w_1500           https://res.cloudinary.com/demo/image/upload/w_1500/folder/image.jpg  
+ ------ -------- --------- ---------------- ---------------------------------------------------------------------- 
diff --git a/tests/Command/InfoCommandTest.php b/tests/Command/InfoCommandTest.php
index 6d27d86..58ba9f5 100644
--- a/tests/Command/InfoCommandTest.php
+++ b/tests/Command/InfoCommandTest.php
@@ -71,6 +71,20 @@ private function adminReturningTheAsset(): Admin
                                 'transformation' => 'w_2000',
                                 'url' => 'https://res.cloudinary.com/demo/image/upload/w_2000/folder/image.png',
                             ],
+                            [
+                                'id' => 'd4',
+                                'format' => 'gif',
+                                'bytes' => 1024,
+                                'transformation' => 'w_10',
+                                'url' => 'https://res.cloudinary.com/demo/image/upload/w_10/folder/image.gif',
+                            ],
+                            [
+                                'id' => 'd5',
+                                'format' => 'jpg',
+                                'bytes' => 1_048_575,
+                                'transformation' => 'w_1500',
+                                'url' => 'https://res.cloudinary.com/demo/image/upload/w_1500/folder/image.jpg',
+                            ],
                         ],
                     ],
                     [],
diff --git a/tests/Command/UploadCommandTest.php b/tests/Command/UploadCommandTest.php
index 65c84ed..d99388f 100644
--- a/tests/Command/UploadCommandTest.php
+++ b/tests/Command/UploadCommandTest.php
@@ -9,20 +9,16 @@
 use Override;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
+use Psl\Env;
+use Psl\Filesystem;
+use Psl\SecureRandom;
 use Psl\Type;
+use Psl\Vec;
 use Speicher210\CloudinaryBundle\Cloudinary\Uploader;
 use Speicher210\CloudinaryBundle\Command\UploadCommand;
 use Symfony\Component\Console\Tester\CommandTester;
 
-use function mkdir;
 use function preg_quote;
-use function realpath;
-use function rmdir;
-use function sort;
-use function sys_get_temp_dir;
-use function touch;
-use function uniqid;
-use function unlink;
 
 /**
  * The table shows absolute paths, so its column widths depend on where the tests run: the display is not compared with
@@ -33,29 +29,26 @@ final class UploadCommandTest extends TestCase
 {
     private const array FILE_NAMES = ['document.pdf', 'logo.png', 'photo.jpg'];
 
+    /** @var non-empty-string */
     private string $directory;
 
     #[Override]
     protected function setUp(): void
     {
-        $directory = sys_get_temp_dir() . '/' . uniqid('cloudinary-bundle-upload-', true);
-        mkdir($directory);
+        $directory = Env\temp_dir() . '/cloudinary-bundle-upload-' . SecureRandom\string(16);
+        Filesystem\create_directory($directory);
         foreach (self::FILE_NAMES as $fileName) {
-            touch($directory . '/' . $fileName);
+            Filesystem\create_file($directory . '/' . $fileName);
         }
 
         // The command shows real paths, and the temporary directory may be behind a symbolic link.
-        $this->directory = Type\string()->assert(realpath($directory));
+        $this->directory = Type\non_empty_string()->coerce(Filesystem\canonicalize($directory));
     }
 
     #[Override]
     protected function tearDown(): void
     {
-        foreach (self::FILE_NAMES as $fileName) {
-            unlink($this->directory . '/' . $fileName);
-        }
-
-        rmdir($this->directory);
+        Filesystem\delete_directory($this->directory, recursive: true);
     }
 
     public function testUploadsEveryFileWithThePrefixedFileNameAsPublicId(): void
@@ -78,14 +71,13 @@ static function (mixed $file, array $options) use (&$uploads): ApiResponse {
 
         $commandTester->assertCommandIsSuccessful();
 
-        sort($uploads);
         self::assertSame(
             [
                 [$this->directory . '/document.pdf', ['public_id' => 'uploads/document']],
                 [$this->directory . '/logo.png', ['public_id' => 'uploads/logo']],
                 [$this->directory . '/photo.jpg', ['public_id' => 'uploads/photo']],
             ],
-            $uploads,
+            Vec\sort($uploads),
         );
 
         $display = $commandTester->getDisplay();