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kotlinlang

I've got a little question why doesn't the abstract Number class have 
abstract operator functions like plus, minus, times, div, ...
As this would allow for operations like 

```
val x: Number = 1  //There is no specific reason here why you would like to do this, but it's the 
val y: Number = 1 + x //easiest example I could come up with.
```
I know java doesn't do this either and there probably is probably a good reason for it. What am I missing here?