iterators

Kiesel 0.4.0 发布，升级到 Zig 0.17，新增 Kiesel.args/env API、多个迭代器提案实现（Iterator Join、Includes、Chunking）以及 Await Dictionary 支持，并成功移植到 SerenityOS。

This article explores the design evolution of Go's slices.Backward function, illustrating different implementations from simple reversal to callback-based iterators, and explains why the standard library's iterator signature looks the way it does.