CHANG Rui

Got DeprecationWarning from mongoose

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The file saving was successful, only if this not appear in my node console... ``` (node:27019) DeprecationWarning: `ensureIndex()` is deprecated in Mongoose >= 4.12.0, use `createIndex()` instead ``` I did...

able to handle with numbers like `1E9`, `1e9`, `1E-9`, etc, which are possible to be returned b Lark server.

v2 proposal: a `Startupable` interface as the counterpart to `Shutdownable`

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## The point samber/do provides `Shutdownable` interface so we can drop connections, stop background tasks... to achieve a graceful shutdown. I think it would be good if samber/do also supports...