diff --git a/.phpstan.test.neon b/.phpstan.test.neon
index bf1a786..f9ae000 100644
--- a/.phpstan.test.neon
+++ b/.phpstan.test.neon
@@ -1,5 +1,2 @@
-parameters:
-    checkMissingIterableValueType: false
-
 includes:
 - vendor/phpstan/phpstan-phpunit/extension.neon
diff --git a/src/Stream/ResourceStream.php b/src/Stream/ResourceStream.php
index 7712c13..aa2c57b 100644
--- a/src/Stream/ResourceStream.php
+++ b/src/Stream/ResourceStream.php
@@ -115,6 +115,10 @@ public function rewind(): bool
     public function isWritable(): bool
     {
         $metaData = \stream_get_meta_data($this->resource);
+        if (!\array_key_exists('uri', $metaData)) {
+            throw new \UnexpectedValueException('Cannot determine whether resource is writable, meta data does not contain the `uri` key');
+        }
+
         return \is_writable($metaData['uri']) || $metaData['uri'] === 'php://memory';
     }
 
@@ -141,7 +145,7 @@ public function isReadable(): bool
     }
 
     /**
-     * @param int<0, max> $length
+     * @param int<1, max> $length
      * @return string
      */
     public function read(int $length): string