I could not find an existing topic regarding this issue but maybe my keywords were simply not the right ones to search for. Regardless, here it comes.
I would love to see default types for generics in Kotlin like Rust has it:
The most prominent example that could make use of this would be Comparable<T> by changing it to Comparable<T = this> but there are more interesting use cases.
sealead class S
class A : S()
class B : S()
open class X<T : A>
class Y : X<B>()
Constructing X is not possible without specifying the concrete type right now, hence, one has to write X<A>() everywhere. This is cumbersome and repetitive and something that was clear for X from the very beginning.
open class X<T : A = A>
class Y() : A<B>()
Now it is possible to construct X without specifying A everywhere: X()