diff -r 47fac1692ede -r 9f70512ae2cf mercurial/bundle2.py
--- a/mercurial/bundle2.py	Sun Nov 10 07:30:14 2019 -0800
+++ b/mercurial/bundle2.py	Fri Nov 08 11:19:20 2019 -0800
@@ -837,11 +837,11 @@
               ignored or failing.
         """
         if not name:
-            raise ValueError(r'empty parameter name')
+            raise ValueError('empty parameter name')
         if name[0:1] not in pycompat.bytestr(
             string.ascii_letters  # pytype: disable=wrong-arg-types
         ):
-            raise ValueError(r'non letter first character: %s' % name)
+            raise ValueError('non letter first character: %s' % name)
         try:
             handler = b2streamparamsmap[name.lower()]
         except KeyError:
@@ -1145,8 +1145,8 @@
             headerchunk = b''.join(header)
         except TypeError:
             raise TypeError(
-                r'Found a non-bytes trying to '
-                r'build bundle part header: %r' % header
+                'Found a non-bytes trying to '
+                'build bundle part header: %r' % header
             )
         outdebug(ui, b'header chunk size: %i' % len(headerchunk))
         yield _pack(_fpartheadersize, len(headerchunk))
@@ -1797,7 +1797,7 @@
 
 
 def addpartbundlestream2(bundler, repo, **kwargs):
-    if not kwargs.get(r'stream', False):
+    if not kwargs.get('stream', False):
         return
 
     if not streamclone.allowservergeneration(repo):
@@ -1819,8 +1819,8 @@
     bundler.prefercompressed = False
 
     # get the includes and excludes
-    includepats = kwargs.get(r'includepats')
-    excludepats = kwargs.get(r'excludepats')
+    includepats = kwargs.get('includepats')
+    excludepats = kwargs.get('excludepats')
 
     narrowstream = repo.ui.configbool(
         b'experimental', b'server.stream-narrow-clones'
@@ -1989,7 +1989,7 @@
     extrakwargs = {}
     targetphase = inpart.params.get(b'targetphase')
     if targetphase is not None:
-        extrakwargs[r'targetphase'] = int(targetphase)
+        extrakwargs['targetphase'] = int(targetphase)
     ret = _processchangegroup(
         op,
         cg,