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On Sunday, 15 November 2015 at 19:51:09 UTC, Andrei Alexandrescu 
wrote:
> Just to clarify - is that referring to the part "We need to 
> change that if we want things like composable containers that 
> work with const." or to the "I think it's a good thing to want" 
> part? -- Andrei

Second part. I don't see a case for const containers at all. 
Fully immutable functional style ones - sure, I have actually 
experimented implementing cache this way in 
https://github.com/Dicebot/mood/blob/master/source/mood/storage/generic_cache.d (thing that powers blog.dicebot.lv). But what would you use const containers for? Mixing mutable and immutable elements in one container? That sounds like a source of much trouble.