The brand of a handle field over the screen's own items, typed by the handle
itself so an edge taken from one of its items backs to that handle: maybe
— one item, or undefined (a swipeable feed's current, the item in front);
stream — a lazy stream of them that may fail with Failure (a feed's
stream, walked by pages or, on a swipeable feed, by swipes).
The brand of a handle field over the screen's own items, typed by the handle itself so an edge taken from one of its items backs to that handle:
maybe— one item, orundefined(a swipeable feed'scurrent, the item in front);stream— a lazy stream of them that may fail withFailure(a feed'sstream, walked by pages or, on a swipeable feed, by swipes).