No way to retrieve the base of a Set or Map in O(1)

Hello, there seems to be no way to retrieve the base of a Set or Map in O(1), since there is no relevant function in the respective libraries and the constructors Bin and Tip are not exported in any module. I think retrieving any one element from a Set or Map might be useful sometimes, so I modestly ask for an implementation. I see that there is splitRoot, but the docs advice, not to rely on the current form of the resulting list, since it might be subject to change. Having this function, with its current result, it might be interesting to be able to efficiently build the union of the lower and the upper parts by simply connecting the trees at their bases. What do you think? Kind regards, André