par2+webdav raises TypeError on Python 3

Duplicity: 0.8.05
Python: 3.7.4
OS: macOS 10.15 (Catalina)

Backtrace of previous error: Traceback (innermost last):
  File "/Users/jacobmiddag/Work/duplicity-0.8.05/duplicity/backend.py", line 371, in inner_retry
    return fn(self, *args)
  File "/Users/jacobmiddag/Work/duplicity-0.8.05/duplicity/backend.py", line 580, in list
    return [tobytes(x) for x in self.backend._list()]
  File "/Users/jacobmiddag/Work/duplicity-0.8.05/duplicity/backends/par2backend.py", line 198, in list
    if c.match(filename):
 TypeError: cannot use a bytes pattern on a string-like object

Attempt 1 failed. TypeError: cannot use a bytes pattern on a string-like object

If I change the code with the following patch it works my case, but I am unsure if `list` should give back strings or bytes.

diff --git a/duplicity/backends/par2backend.py b/duplicity/backends/par2backend.py
index 1b41274..4376195 100644
--- a/duplicity/backends/par2backend.py
+++ b/duplicity/backends/par2backend.py
@@ -131,7 +131,7 @@ class Par2Backend(backend.Backend):

             if returncode:
                 log.Warn(u"File is corrupt. Try to repair %s" % remote_filename)
- par2volumes = list(filter(re.compile(b'%s\\.vol[\\d+]*\\.par2' % remote_filename).match,
+ par2volumes = list(filter(re.compile('%s\\.vol[\\d+]*\\.par2' % remote_filename).match,
                                           self.wrapped_backend._list()))

                 for filename in par2volumes:
@@ -192,7 +192,7 @@ class Par2Backend(backend.Backend):
         """
         remote_list = self.wrapped_backend._list()

- c = re.compile(b'(?!.*\\.par2$)')
+ c = re.compile('(?!.*\\.par2$)')
         filtered_list = []
         for filename in remote_list:
             if c.match(filename):