Autism
Autism
When we use Nullable(XXX), the default return is not what I want. If Float64 is passed null, I want to store it to null .
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 翻阅了源码后发现确实wei未适配。 
 鸿神,这个方法1,会回调两次. 看了下源码   图中是我的业务处理,这个判断建议可以调整下,不然回调两次不好处理业务层