When checking protocol, need to ignore encoding character

src/ZEO/ClientStorage.py

@@ -383,7 +383,7 @@ class ClientStorage(ZODB.ConflictResolution.ConflictResolvingStorage):
                 'interfaces', ()):
                 zope.interface.alsoProvides(self, iface)
 
-        if self.protocol_version >= b'Z5':
+        if self.protocol_version[1:] >= b'5':
             self.ping = lambda : self._call('ping')
         else:
             self.ping = lambda : self._call('lastTransaction')

src/ZEO/StorageServer.py

@@ -228,7 +228,7 @@ class ZEOStorage:
         storage = self.storage
 
         supportsUndo = (getattr(storage, 'supportsUndo', lambda : False)()
-                        and self.connection.protocol_version >= b'Z310')
+                        and self.connection.protocol_version[1:] >= b'310')
 
         # Communicate the backend storage interfaces to the client
         storage_provides = zope.interface.providedBy(storage)

src/ZEO/tests/utils.py

@@ -39,7 +39,7 @@ class StorageServer:
     """
 
     def __init__(self, test, storage,
-                 protocol_version=best_protocol_version,
+                 protocol_version=b'Z' + best_protocol_version,
                  **kw):
         self.test = test
         self.storage_server = ZEO.StorageServer.StorageServer(