Mongoose 5.4.9 发布，MongoDB 异步对象模型工具

Mongoose 5.4.9 已发布，Mongoose 是在 Node.js 异步环境下对 MongoDB 进行便捷操作的对象模型工具。

更新内容如下：

• fix(document): ensure doc array defaults get casted #7337

• fix(document): make save() not crash if nested doc has a property 'get' #7316

• fix(schema): allow using Schema.Types.Map as well as Map to declare a map type #7305

• fix(map): make set after init mark correct path as modified #7321

• fix(mongoose): don't recompile model if same collection and schema passed in to mongoose.model() #5767

• fix(schema): improve error message when type is invalid #7303

• fix(schema): add populated to reserved property names #7317

• fix(model): don't run built-in middleware on custom methods and ensure timestamp hooks don't run if children don't have timestamps set #7342

• docs(schematypes): clarify that you can add arbitrary options to a SchemaType #7340

• docs(mongoose): clarify that passing same name+schema to mongoose.model() returns the model #5767

• docs(index): add useNewUrlParser to example #7368 JIBIN-P

• docs(connection): add useNewUrlParser to examples #7362 JIBIN-P

• docs(discriminators): add back missing example from 'recursive embedded discriminators section' #7349

• docs(schema): improve docs for string and boolean cast() #7351

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