std::make_unique

it must be obvious but I can't find the answer:

Does e.g.

std::make_unique<double[]>(1000)

allways value-initialize the elements? Well, I looked into the implementation and clang as well as g++ are using

new T[size]()

doing value-initialization.

But I can't find that a conforming implementation of C++14 / 17 has to do this.

Any hints?