proc bisect[T; K](a: Sequence[T]; x: K; lo = 0; hi = len(a);
                  key: NoneType | Key[T, K] = None): int

proc bisect_left[T; K](a: Sequence[T]; x: K; lo = 0; hi = len(a);
                       key: NoneType | Key[T, K] = None): int

proc bisect_right[T; K](a: Sequence[T]; x: K; lo = 0; hi = len(a);
                        key: NoneType | Key[T, K] = None): int

proc insort[T; K](a: MutableSequence[T]; x: K; lo = 0; hi = len(a);
                  key: NoneType | Key[T, K] = None)

proc insort_left[T; K](a: MutableSequence[T]; x: K; lo = 0; hi = len(a);
                       key: NoneType | Key[T, K] = None)

proc insort_right[T; K](a: MutableSequence[T]; x: K; lo = 0; hi = len(a);
                        key: NoneType | Key[T, K] = None)