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kotlinlang

Just bumped into it and thought that it might be useful to have something like parameter alias in addition to typealias.
I had a situation where I needed to create the following typealias to keep compatibility with previous versions of source code:
```
typealias Spacing = Horizontal
```
Where `Spacing` _was_ a `data class` with property `size: Int`, and `Horizontal` is a new `data class` with property `height: Int`.
Nothing was broken after that little conversion, although it occured to me that if someone had used named arguments, e.g. `Spacing(size = 8)`, then it wouldn't have been valid, and I don't like the idea that I would have had to rename my `height: Int` back to `size: Int`.
So I'm suggesting that typealiasing classes would also support parameter names aliasing. Off-hand syntax proposal:
```
typealias Type1 = Type2 {
  namealias property11 = property21
  namealias property12 = property22
  ...
}
```
I'm not sure about this feature design though. It might get abused in order to implement polymorphism (might not) which I don't think is a good idea