fix union type

Author: rodber

src/UnionParameter.php

@@ -39,15 +39,18 @@ public function __construct(
         private ParametersInterface $parameters,
         private string $description = '',
     ) {
-        $this->type = $this->type();
         if ($parameters->count() < 2) {
             throw new LogicException(
                 (string) message(
                     'Must pass at least two parameters for union'
                 )
             );
         }
-
+        $types = array_map(
+            fn (ParameterInterface $parameter): string => $parameter->type()->typeHinting(),
+            iterator_to_array($this->parameters)
+        );
+        $this->type = new Type(TypeInterface::UNION, ...$types);
         $this->parameters = $parameters;
     }
 

tests/UnionParameterTest.php

@@ -45,6 +45,7 @@ public function testConstruct(): void
             bar: int()
         );
         $parameter = new UnionParameter($parameters);
+        $this->assertSame('string|int', $parameter->type()->typeHinting());
         $this->assertSame(
             TypeInterface::UNION,
             $parameter->type()->primitive()