On architectures like x86, memory addressing supports Base - Offset. A C compiler can fold the tag clearing and the subsequent struct access (like .car or .cdr) into a single instruction, saving a CPU register.
Екатерина Грищенко (старший редактор отдела «Бывший СССР»)
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Pushing the burden of correctness outward causes problems for reusability.，详情可参考传奇私服新开网｜热血传奇SF发布站｜传奇私服网站
第二个原因，是基础设施的准备。
Cocoa beans, the main ingredient in chocolate, are first fermented after being harvested and then left to dry in the sun