Optimizing Immutable Data?

[Jack Stouffer via digitalmars-d-ldc]

On Tuesday, 7 July 2015 at 21:19:19 UTC, David Nadlinger wrote:
> Unfortunately, I don't recall any details – there were many 
> discussions at DConf. I'm afraid I need a little help as to 
> which specific remark Jack means.

I saw it on the original live stream. I am currently watching the 
Dconf videos as they are released on YouTube so I'm sure I will 
find it eventually.