import { SortedSetLeaf } from "https://deno.land/x/rimbu@0.13.5/sorted/set-custom/implementation/immutable.ts";
Returns
[T, SortedSetLeaf<T>]
x/rimbu/sorted/set-custom/implementation/immutable.ts>SortedSetLeaf#mutateSplitRight
import { SortedSetLeaf } from "https://deno.land/x/rimbu@0.13.5/sorted/set-custom/implementation/immutable.ts";