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Improve Unmarshal docs (#713)

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Closes #589
Closes  #588
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Márk Sági-Kazár 2019-06-14 17:17:12 +02:00 committed by Steve Francia
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@ -643,6 +643,8 @@ if err != nil {
}
```
Viper uses [github.com/mitchellh/mapstructure](https://github.com/mitchellh/mapstructure) under the hood for unmarshaling values which uses `mapstructure` tags by default.
### Marshalling to string
You may need to marshal all the settings held in viper into a string rather than write them to a file.