fix

Author: samsonasik

src/BetterPhpDocParser/ValueObject/Type/BracketsAwareUnionTypeNode.php

@@ -25,6 +25,7 @@ public function __construct(
      */
     public function __toString(): string
     {
+        $this->types = array_unique($this->types, SORT_REGULAR);
         if (! $this->isWrappedInBrackets) {
             return implode('|', $this->types);
         }