self._path was removed, only self.path exists)SameSite optiontimeout provided.nsscrypto backend is now properly identified as providing AES support.encrypt_key is None.SameSite through the samesite option.Lax, but can be set to Strict or None to disable it.async as a variable in code, this fixes a compatibility problem with Python 3.7 where it's a keyword.FileNamespaceManager.ext.database backend will now properly close connections.FileNamespaceManager is interrupted while writing a new file.DBMNamespaceManager and FileSynchronizer will now deal with directories disappearing while they try to write to them.ext:mongodb and ext:redis namespace managers.Secure, Domain and so on where lost.Cookie module import on case insensitive file systems should have been resolved.dumps and loads methods.session_class argument.invalidate_corrupt option to CookieSessions too for valid cookies containing invalid data.