Do the padding bytes of a POD type get copied?

Question

Suppose I have a POD type like this:

struct A {
    char a;
    int b;
};

On my system, sizeof(A) == 8, even though size

Answer 1

The implicitly-defined copy/move constructor for a non-union class X performs a memberwise copy/move of its bases and members.

12.8/15 [class.copy] in N4141

The bit pattern in the padding bytes is thus allowed to differ.