When I was first learning Ruby, having to invert my natural thought process in order to use `include?` was one of the most frustrating things I had to get used

When I was first learning Ruby, having to invert my natural thought process in order to use `include?` was one of the most frustrating things I had to get used to. I think that's more a testament to how amazing Ruby is at imitating natural language patterns when that was my biggest complaint. Having said that, I don't agree that it needs to be an operator over a method. I agree that it would be prettier, but methods provide additional benefits like being easy to override or pass as arguments to other methods (like :respond_to?). If you're ok with a method, you can easily monkey patch ruby to support an `in` (or `in?`) method yourself.