add typehints and return types

src/Generator/PeclUuidRandomGenerator.php

@@ -25,10 +25,10 @@ class PeclUuidRandomGenerator implements RandomGeneratorInterface
     /**
      * Generates a string of random binary data of the specified length
      *
-     * @param integer $length The number of bytes of random binary data to generate
+     * @param int $length The number of bytes of random binary data to generate
      * @return string A binary string
      */
-    public function generate($length)
+    public function generate(int $length): string
     {
         $uuid = uuid_create(UUID_TYPE_RANDOM);