Const correctness revisited (proposal)

[Oliver Dathe]

Janice Caron wrote:
> Just to be pedantic, the word is "constancy", not "const-ness". :-)

Walter started with "const-ness", i just added another typo :)

For the rest see my reply to Walter.

Regarding the slices: In the DConf slides, Walter and Andrei propose a 
superior way of distinguishing between 'window' slices T[] and 
expandable 'genuine' arrays T[new]. See page 26.