fixup! Add native return type declaration support to NarrowReturnUnionToCollectionRector

Author: TomasVotruba

rules/TypedCollections/Rector/ClassMethod/NarrowReturnUnionToCollectionRector.php

@@ -119,7 +119,7 @@ private function refactorReturnDocblockTag(ClassMethod $classMethod): bool
 
     private function hasNativeCollectionType(ClassMethod $classMethod): bool
     {
-        if (! $classMethod->returnType) {
+        if (!$classMethod->returnType instanceof Node) {
             return false;
         }
 
@@ -128,7 +128,7 @@ private function hasNativeCollectionType(ClassMethod $classMethod): bool
 
     private function refactorNativeReturn(ClassMethod $classMethod): bool
     {
-        if ($classMethod->returnType === null) {
+        if (!$classMethod->returnType instanceof Node) {
             return false;
         }
 
@@ -157,11 +157,7 @@ private function refactorNativeReturn(ClassMethod $classMethod): bool
             }
         }
 
-        if (count($unionType->types) === 1) {
-            $classMethod->returnType = array_pop($unionType->types);
-        } else {
-            $classMethod->returnType = $unionType->types;
-        }
+        $classMethod->returnType = count($unionType->types) === 1 ? array_pop($unionType->types) : $unionType->types;
 
         return true;
     }