I’m sorry, it appears that the server doesn’t support that flag.
That code is written in some really inscrutable programmer-ese, so it’s hard for me to say exactly where the change needs to be made.
You actually have to replace calls like this…
find().fetch() and call
sub.added on each resulting document. No more
observe, no more
There are a few of them, so this is a bit involved, but not at all as error-proned as it may appear.