A modern programming language that makes developers happier.

kotlinlang

Create `indexOfOrNull`, it's free and encouraged to make things the way you want.   There are a lot of posts where people want different things.  Which is great, readability and coding styles vary.   Kotlin is designed so you can extend API as you need.   If things happen a lot in the wild, analysis of public code tells the team what changes to make (maybe)  in stdlib.   So to get changes to stdlib, it's not about talking here;  it's about doing it, many people doing it, and pull requests or youtrack tickets.