**Just** +containers

*O(log(min(i,n-i)))*. Update the element at the specified position. If the position is out of range, the original sequence is returned.

*O(min(n,W))*. Adjust a value at a specific key. When the key is not a member of the map, the original map is returned.
> adjust ("new " ++) 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "new a")]
> adjust ("new " ++) 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
> adjust ("new " ++) 7 empty == empty

*O(log n)*. Update a value at a specific key with the result of the provided function. When the key is not a member of the map, the original map is returned.
> adjust ("new " ++) 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "new a")]
> adjust ("new " ++) 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
> adjust ("new " ++) 7 empty == empty

*O(min(n,W))*. Adjust a value at a specific key. When the key is not a member of the map, the original map is returned.
> let f key x = (show key) ++ ":new " ++ x
> adjustWithKey f 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "5:new a")]
> adjustWithKey f 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
> adjustWithKey f 7 empty == empty

*O(log n)*. Adjust a value at a specific key. When the key is not a member of the map, the original map is returned.
> let f key x = (show key) ++ ":new " ++ x
> adjustWithKey f 5 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "5:new a")]
> adjustWithKey f 7 (fromList [(5,"a"), (3,"b")]) == fromList [(3, "b"), (5, "a")]
> adjustWithKey f 7 empty == empty