TASK: Put domain logic inside constructor of UnionType

Author: mhsdesign

src/TypeSystem/Type/UnionType/UnionType.php

@@ -32,11 +32,6 @@ final class UnionType implements TypeInterface
     private array $members;
 
     private function __construct(TypeInterface ...$members)
-    {
-        $this->members = $members;
-    }
-
-    public static function of(TypeInterface ...$members): TypeInterface
     {
         $uniqueMembers = [];
         foreach ($members as $member) {
@@ -48,9 +43,15 @@ public static function of(TypeInterface ...$members): TypeInterface
 
             $uniqueMembers[] = $member;
         }
+        $this->members = $uniqueMembers;
+    }
+
+    public static function of(TypeInterface ...$members): TypeInterface
+    {
+        $union = new self(...$members);
 
-        if (count($uniqueMembers) === 1) {
-            return $uniqueMembers[0];
+        if (count($union->members) === 1) {
+            return $union->members[0];
         }
 
         return new self(...$members);