method LeafTree.prototype.appendMiddleRe-exportimport { LeafTree } from "https://deno.land/x/rimbu@1.0.4/list/custom/index.ts"; appendMiddle(child: LeafBlock<T>): NonLeaf<T, LeafBlock<T>>Parameterschild: LeafBlock<T>ReturnsNonLeaf<T, LeafBlock<T>>