Indexing access for Lists and Maps considered harmful?

[Mark Thornton]

Lawrence Kesteloot wrote:
> Neal's argument about the ability to return an "equivalent" object is
> valid. Something has to give, that I would pick that. It's reasonable
> in nearly all cases to just return the RHS object.
>
>   
If the RHS value is going to be boxed, I think it is important that it 
be boxed only once and not separately for each assignment.

Mark Thornton