--- a/hgext3rd/serverminitopic.py	Tue Aug 06 15:06:27 2019 +0200
+++ b/hgext3rd/serverminitopic.py	Tue Aug 06 15:06:38 2019 +0200
@@ -33,7 +33,7 @@
 
     configtable = {}
     configitem = registrar.configitem(configtable)
-    configitem('experimental', 'server-mini-topic',
+    configitem(b'experimental', b'server-mini-topic',
                default=False,
     )
 
@@ -44,7 +44,7 @@
     """
     enabled = getattr(repo, '_hasminitopic', None)
     if enabled is None:
-        enabled = (repo.ui.configbool('experimental', 'server-mini-topic')
+        enabled = (repo.ui.configbool(b'experimental', b'server-mini-topic')
                    and not repo.publishing())
         repo._hasminitopic = enabled
     return enabled
@@ -54,10 +54,10 @@
 def topicbranch(orig, self):
     branch = orig(self)
     if hasminitopic(self._repo) and self.phase():
-        topic = self._changeset.extra.get('topic')
+        topic = self._changeset.extra.get(b'topic')
         if topic is not None:
             topic = encoding.tolocal(topic)
-            branch = '%s:%s' % (branch, topic)
+            branch = b'%s:%s' % (branch, topic)
     return branch
 
 ### avoid caching topic data in rev-branch-cache
@@ -120,7 +120,7 @@
     if revs:
         s = hashlib.sha1()
         for rev in revs:
-            s.update('%d;' % rev)
+            s.update(b'%d;' % rev)
         key = s.digest()
     return key
 
@@ -138,8 +138,8 @@
         branchmap.branchcache = previous
 
 _publiconly = set([
-    'base',
-    'immutable',
+    b'base',
+    b'immutable',
 ])
 
 def mighttopic(repo):
@@ -216,7 +216,7 @@
 def wireprotocaps(orig, repo, proto):
     caps = orig(repo, proto)
     if hasminitopic(repo):
-        caps.append('topics')
+        caps.append(b'topics')
     return caps
 
 # wrap the necessary bit