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It is advised to use abstract Gradle properties. Gradle will provide the implementation.

Iirc you can even simply define it as interface, it does not even have to be an abstract class.

yep, I meant `abstract` as in either an `interface` or an `abstract class`

My question is more like:
```interface Param {
  var someValue: String
}```
vs
```interface Param {
  val someValue: Property&lt;String&gt;
}```


Definitely the latter. For consistency and also because it allows you to wire providers.

For example if you are wiring a system property provider and the service is only used at execution time, then that system property won't take part of the configuration cache key. If you use a plain string then you need to do the system property read at configuration time.

Definitely the latter, yes.
Can you even use a plain `String` when it is abstract?