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- A lot of code won't work for types with no default constructors, but that is at least compile error

- Using memcpy[0] for arbitrary types is just wrong, see [1]

This is already noted in the Queue readme, only the Queue constructs the type, the other 2 data structures are meant for PODs only.

I will take a look at adding support for constructing in-place for the other 2 data structures, but at the moment, they are just for PODs.