stream method
Streams the entries from fromPage, loading the pages as it goes.
Implementation
Stream<O> stream({int fromPage = 1}) async* {
var page = fromPage;
while (true) {
var entries = await loadPage(page);
if (entries.isEmpty) break;
for (var o in entries) {
yield o;
}
var finalPage = _finalPage;
if (finalPage != null && page >= finalPage) break;
++page;
}
}