Duplicate tags field in Stream crashes sync

For some context, see #10 (closed). Currently using the dev build provided there.

For special Feedly features, I'm using boards in addition to categories, but other than that I can't think of anything that would break things.

feedly-cefaea98-5543-4781-9ee9-d62dedbfa560-2020-08-13.opml

If you're willing to extend the rust example you posted on the other issue, I can run it locally and get some better output. I can code, but am only just beginning to learn rust.