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kotlinlang

Hi! I am using Kotlin with Spring's @Value annotation and I am getting unexpected results. 

```
@Value("\${email.address.override}")
private val addressOverride: String? = null
```

When I  set the property in my application.yml file it returns the value of the property as expected. However, if I omit the property, it returns the name of the property (${email.address.override}) as the value instead of null as I would expect. Is this the intended behaviour?