No null. Mog uses ?T (Optional) for values that might be absent — ?int, ?string (see Chapter 10). The type system distinguishes between “definitely has a value” and “might not have a value.” You cannot accidentally dereference something that does not exist.
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Skills，简单说就是技能包。就像上述生成周报的固定流程、专业操作，可以封装成可调用的skills。成熟的skills相当于一个上过培训课的新员工，能快速上岗完成工作。
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