Allowing mixed body parameter

Author: ezimuel

src/Traits/EndpointTrait.php

@@ -88,8 +88,10 @@ protected function addQueryString(string $url, array $params, array $keys): stri
 
     /**
      * Serialize the body using the Content-Type
+     * 
+     * @param mixed $body
      */
-    protected function bodySerialize(array $body, string $contentType): string
+    protected function bodySerialize($body, string $contentType): string
     {
         if (strpos($contentType, 'application/x-ndjson') !== false) {
             return NDJsonSerializer::serialize($body, ['remove_null' => false]);