Smart motion tracking
第十一条 增值税法第十六条所称增值税扣税凭证，应当符合国务院税务主管部门的有关规定，具体包括增值税专用发票、海关进口增值税专用缴款书、完税凭证、农产品收购发票、农产品销售发票以及其他具有进项税额抵扣功能的扣税凭证。
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For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
They all organize data by location so you can skip irrelevant regions, replacing "check everything" with "check the things that could possibly matter." That's what took us from a million comparisons to ten.