--- a/mercurial/registrar.py	Tue Oct 08 19:35:30 2019 -0700
+++ b/mercurial/registrar.py	Sun Oct 06 20:17:41 2019 -0700
@@ -65,7 +65,7 @@
             msg = b'duplicate registration for name: "%s"' % name
             raise error.ProgrammingError(msg)
 
-        if func.__doc__ and not util.safehasattr(func, b'_origdoc'):
+        if func.__doc__ and not util.safehasattr(func, '_origdoc'):
             func._origdoc = func.__doc__.strip()
             doc = pycompat.sysbytes(func._origdoc)
             func.__doc__ = pycompat.sysstr(self._formatdoc(decl, doc))