simplified unpacking boolean and added null

Author: stefanak-michal

Unpacker.php

@@ -77,10 +77,17 @@ private function u()
         if ($result) {
             return $output;
         }
-        $output = $this->unpackBoolean($marker, $result);
-        if ($result) {
-            return $output;
+        
+        if ($marker == 0xC3) {
+            return true;
         }
+        if ($marker == 0xC2) {
+            return false;
+        }
+        if ($marker == 0xC0) {
+            return null;
+        }
+        
         $output = $this->unpackFloat($marker, $result);
         if ($result) {
             return $output;
@@ -325,23 +332,6 @@ private function unpackMap(int $marker, bool &$result = false): array
 
         return $output;
     }
-    
-    /**
-     * @param int $marker
-     * @param bool $result
-     * @return bool
-     */
-    private function unpackBoolean(int $marker, bool &$result = false): bool
-    {
-        if ($marker == 0xC3) {
-            $result = true;
-            return true;
-        } elseif ($marker == 0xC2) {
-            $result = true;
-            return false;
-        }
-        return false;
-    }
 
     /**
      * @param int $marker