Sometimes I don’t want to study any new cards, just review the ones I’ve already learned. I do this on AnkiDroid by doing a custom review ahead with days = 0.
I tried to do the same on the desktop version of Anki, but cards due the following day were added to the custom deck even when I set days=0. In other words, the decks from days=1 and days=0 were identical.
I’m aware that there’s another way to do this (Study by card state -> Due cards only), but it would be nice to have the behavior with days=0 to make sense and be consistent with AnkiDroid.
Oh, I wasn’t aware of the spinner limitation (I never really use it).
I think some confusion could be avoided by either notifying the user that 0 isn’t a valid typed input or just allowing users to review ahead 0 days.
Users can accomplish the same thing as days=0 other ways, but that doesn’t mean that they shouldn’t also be able to do it this way. It’d make the custom study a little more intuitive to me, at least.
Just one man’s opinion, feel free to take it or leave it.