Sync with weierophinney/fig-standards#b8f87f4

Author: weierophinney

src/MessageInterface.php

@@ -126,7 +126,7 @@ public function removeHeader($header);
     /**
      * Gets the body of the message.
      *
-     * @return StreamableInterface|null Returns the body, or null if not set.
+     * @return StreamableInterface Returns the body as a stream.
      */
     public function getBody();
 

src/ServerRequestInterface.php

@@ -79,6 +79,11 @@ public function setCookieParams(array $cookies);
      *
      * Retrieves the deserialized query string arguments, if any.
      *
+     * Note: the query params might not be in sync with the URL or server
+     * params. If you need to ensure you are only getting the original
+     * values, you may need to parse the composed URL or the `QUERY_STRING`
+     * composed in the server params.
+     *
      * @return array
      */
     public function getQueryParams();
@@ -94,6 +99,9 @@ public function getQueryParams();
      * purposes of how duplicate query parameters are handled, and how nested
      * sets are handled.
      *
+     * Setting query string arguments MUST NOT change the URL stored by the
+     * request, nor the values in the server params.
+     *
      * @param array $query Array of query string arguments, typically from
      *     $_GET.
      * @return void