Типы данных массива и среза

Меня смутили типы данных arrayи slice.

В документации Go массивы описываются следующим образом:

There are major differences between the ways arrays work in Go and C. In Go,

• Arrays are values. Assigning one array to another copies all the elements.
• In particular, if you pass an array to a function, it will receive a copy of the array, not a pointer to it.
• The size of an array is part of its type. The types [10]int and [20]int are distinct.

Функции:

As in all languages in the C family, everything in Go is passed by value. That is, a function always gets a copy of the thing being passed, as if there were an assignment statement assigning the value to the parameter. For instance, passing an int value to a function makes a copy of the int, and passing a pointer value makes a copy of the pointer, but not the data it points to.

Почему sort.Ints(arrayValue)изменяет переданную переменную, когда я объявил ее как массив, а не как срез?

Код

var av = []int{1,5,2,3,7}

fmt.Println(av)
sort.Ints(av)
fmt.Println(av)
return

Выход

[1 5 2 3 7]
[1 2 3 5 7]