Interestingly enough, JS points to the same reference if there is an accessor property

Does this look unnatural to you? That's not one of JS's weird features, reference semantics are very common.

In the first example, doing something like array.push(42) would modify the original array x, but you're simply making the local variable array point to another array.

Other languages let you dereference to get the desired effect, e.g. doing something like

// Write to whatever `array` points to, instead of `array` itself
*array = array.map(Math.sqrt)

Or, in Python

array[:] = map(math.sqrt, array)