NativePromise::all/allSettled take a Vector<T>& rather than a const Vector<T>& ; so you can't use them with a rvalue parameter. Preventing to do things like:

```
SourceBuffer::ComputeSeekPromise::all(RunLoop::main(), WTF::map(*m_activeSourceBuffers, [&](auto&& sourceBuffer) {
        return sourceBuffer->computeSeekTime(seekTarget);
    }))
```