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"discountValue": 100
，更多细节参见safew官方下载
// 单调栈：存储"待匹配更大值"的元素，栈内保持单调递减（核心）
Implementers shouldn't need to jump through these hoops. When you find yourself needing to relax or bypass spec semantics just to achieve reasonable performance, that's a sign something is wrong with the spec itself. A well-designed streaming API should be efficient by default, not require each runtime to invent its own escape hatches.