splice

Return zipper with the children of the current node in `zloc` merged into itself. (akin to Clojure's `unquote-splicing` macro: `~@...`). - if the node is not one that can have children, no modification will be performed. - if the node has no or only whitespace children, it will be removed. - otherwise, splicing will be performed, moving the zipper to the first non-whitespace spliced child node. For example, given `[[1 2 3] 4 5 6]`, if zloc is located at vector `[1 2 3]`, a splice will result in raising the vector's children up `[1 2 3 4 5 6]` and locating the zipper at node `1`.