[PropertyInfo] Fix bigint extraction with type info

Author: mtarld

Diff for: PropertyInfo/DoctrineExtractor.php

@@ -133,7 +133,7 @@ public function getType(string $class, string $property, array $context = []): ?
 
         // DBAL 4 has a special fallback strategy for BINGINT (int -> string)
         if (Types::BIGINT === $typeOfField && !method_exists(BigIntType::class, 'getName')) {
-            return Type::collection(Type::int(), Type::string());
+            return $nullable ? Type::nullable(Type::union(Type::int(), Type::string())) : Type::union(Type::int(), Type::string());
         }
 
         $enumType = null;

Diff for: Tests/PropertyInfo/DoctrineExtractorTest.php

@@ -286,7 +286,7 @@ public static function typeProvider(): iterable
     {
         // DBAL 4 has a special fallback strategy for BINGINT (int -> string)
         if (!method_exists(BigIntType::class, 'getName')) {
-            $expectedBigIntType = Type::collection(Type::int(), Type::string());
+            $expectedBigIntType = Type::union(Type::int(), Type::string());
         } else {
             $expectedBigIntType = Type::string();
         }