--- a/hgext3rd/evolve/obshistory.py	Thu Jul 11 16:04:17 2019 -0700
+++ b/hgext3rd/evolve/obshistory.py	Thu Jul 11 14:46:17 2019 -0700
@@ -473,7 +473,7 @@
         shortdescription = shortdescription.splitlines()[0]
 
     fm.startitem()
-    fm.write('node', '%s', str(ctx),
+    fm.write('node', '%s', bytes(ctx),
              label="evolve.node")
     fm.plain(' ')