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digitalmars.D - Compile-time branching on type size between segregator members during

After looking at

https://www.youtube.com/watch?v=kaA3HPgowwY

and

std.experimental.allocator.building_blocks.segregator.Segregator

I wonder if

     Segregator.allocate()

is missing an important optimization on calls to

     someSegregatorInstance.make!T()

where the choice of selecting the right segregator member can be 
done at _compile-time_ instead of run-time because `T.sizeof` is 
known at compile time. If so, what about adding an optional 
member to the allocator API, say,

     void[] allocate(size_t s)()

that can realize this idea?
Sep 23 2018