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?