It Min

seq := func(yield func(int) bool) {
    _ = yield(5)
    _ = yield(2)
    _ = yield(8)
    _ = yield(1)
    _ = yield(9)
}
min := it.Min(seq)
// min == 1

seq := func(yield func(string) bool) {
    _ = yield("zebra")
    _ = yield("apple")
    _ = yield("banana")
}
min := it.Min(seq)
// min == "apple" (lexicographically smallest)