improvement request - enabling by-value-containers

[Kagamin]

Jonathan Schmidt-Dominé Wrote:

> Just about my experiences: When trying to hack some algorithms quickly in 
> Ruby I made a lot of mistakes because I had to care about a .clone 
> everywhere and because Array.new(5, []) does not work as expected (sorry, 
> but Array.new(5) { return [] } is not nice). So in fact C++ made my life 
> easier than the new, stylish, simple Ruby-programming-language, because of 
> the great by-value-containers in the STL.

Hmm... never needed to clone a container. Is there a use case for by-value containers?