Issue #11657: Fix sending file descriptors over 255 over a multiprocessing Pipe.
Also added some tests.
diff --git a/Misc/NEWS b/Misc/NEWS
index b2d9e84..4b5a9a6 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -268,6 +268,9 @@
 Library
 -------
 
+- Issue #11657: Fix sending file descriptors over 255 over a multiprocessing
+  Pipe.
+
 - Issue #12811: tabnanny.check() now promptly closes checked files. Patch by
   Anthony Briggs.