--- a/mercurial/wireprotoframing.py	Thu Aug 23 13:50:47 2018 -0700
+++ b/mercurial/wireprotoframing.py	Wed Sep 05 09:04:40 2018 -0700
@@ -419,6 +419,8 @@
                            payload=b'')
 
 def createcommanderrorresponse(stream, requestid, message, args=None):
+    # TODO should this be using a list of {'msg': ..., 'args': {}} so atom
+    # formatting works consistently?
     m = {
         b'status': b'error',
         b'error': {