Bugfixes

- Fixed `Url` not outputting correct class when used in json_encode.
- Fixed `IInputItem` being too strict about strings which may be nullable.

src/Pecee/Http/Url.php

@@ -4,7 +4,7 @@ namespace Pecee\Http;
 
 use Pecee\Http\Exceptions\MalformedUrlException;
 
-class Url
+class Url implements \JsonSerializable
 {
     private $originalUrl;
 
@@ -441,7 +441,19 @@ class Url
         return $scheme . $user . $pass . $host . $port . $this->getRelativeUrl();
     }
 
-    public function __toString()
+    /**
+     * Specify data which should be serialized to JSON
+     * @link http://php.net/manual/en/jsonserializable.jsonserialize.php
+     * @return mixed data which can be serialized by <b>json_encode</b>,
+     * which is a value of any type other than a resource.
+     * @since 5.4.0
+     */
+    public function jsonSerialize(): string
+    {
+        return $this->getRelativeUrl();
+    }
+
+    public function __toString(): string
     {
         return $this->getRelativeUrl();
     }