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kotlinlang

Hi! I continue with this, and I found another point I’m not sure about. When transforming the `ext` to Kotlin dsl, after quite some time I’ve found that some similar is using the `extra` delegate. I have the root build.gradle, and the module one. To use an extra I need to do:

root script:
```
val androidCompileSdkVersion by extra { 26 }
```

module script:
```
    val androidCompileSdkVersion: Int by extra
    compileSdkVersion(androidCompileSdkVersion)
```