Declare methods in class merge with an interface extending another interface

[Schahen]

Following code:

interface StatsBase<T> {
   isFile(): boolean;

   atime: Date;
   mtime: Date;
   ctime: Date;
}

interface Stats extends StatsBase<number> {
}

declare class Stats {}

is translated to

external interface StatsBase<T> {
    fun isFile(): Boolean
    var atime: Date
    var mtime: Date
    var ctime: Date
}

external open class Stats : StatsBase<Number>

Why actually interface Stats and class Stats are merged, according to the typescript merging rules into a single class which actually Suppose to implements StatsBase, otherwise it won't compile.

[Schahen]

This one was fixed quite for a while