// 单调栈：存储"待匹配更大值"的元素，栈内保持单调递减（核心）
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，详情可参考夫子
get_expr_type(inner) (storage-oriented), which could report a widened
After more back-and-forth with design nitpicks and more features to add, the package is feature complete. However, it needs some more polish and a more unique design before I can release it, and I got sidetracked by something more impactful…