Apply suggestions from code review

Author: mzur

src/FileCache.php

@@ -567,7 +567,14 @@ protected function cacheFromResource(File $file, $source, $target)
         $maxBytes = intval($this->config['max_file_size']);
         // Copy one byte more than allowed to detect files that exceed the limit.
         // Using $maxBytes directly would reject files of exactly $maxBytes bytes.
-        $copyLimit = $maxBytes >= 0 ? $maxBytes + 1 : -1;
+        // Clamp at PHP_INT_MAX to avoid overflowing to float for very large limits.
+        if ($maxBytes < 0) {
+            $copyLimit = -1;
+        } elseif ($maxBytes < PHP_INT_MAX) {
+            $copyLimit = $maxBytes + 1;
+        } else {
+            $copyLimit = PHP_INT_MAX;
+        }
         $bytes = stream_copy_to_stream($source, $target, $copyLimit);
 
         if ($bytes === false) {

tests/FileCacheTest.php

@@ -109,6 +109,7 @@ public function testGetRemoteExactlyMaxSize()
         $cache->stream = $stream;
         $path = $cache->get($file, $this->noop);
         $this->assertEquals(3, filesize($path));
+        $this->assertFalse(is_resource($cache->stream));
     }
 
     public function testGetDiskDoesNotExist()
@@ -200,7 +201,6 @@ public function testGetDiskCloudExactlyMaxSize()
     {
         config(['filesystems.disks.s3' => ['driver' => 's3']]);
         $file = new GenericFile('s3://files/image.txt');
-        $hash = hash('sha256', 's3://files/image.txt');
 
         $stream = fopen('php://temp', 'r+');
         fwrite($stream, 'abc');