let position = POS[vertex_index as usize];
field1: rkyv::option::Option,
。业内人士推荐PDF资料作为进阶阅读
Екатерина Грищенко (старший редактор отдела «Бывший СССР»)
The important understanding is that existing abstractions shouldn't be "extended" with new functionality, even if the change is backwards compatible.