This was handled in a somewhat so-so manner in += and friends.

Specifically, it ignored the [*] on the LHS and just assigned the
variable to the result of the automap.

So, x[*]+=10; was transformed to x = x[*] + 10;

It also only worked for += with friends, not =, so x[*] = x[*] + 1 did
not work.

Now a new opcode is used that assigns array elements individually.
This means that this works:

|  array x = ({1,2,3});
|  array y = x;
|
|  x[*] += 10;
|  x==y; // will now be true, was previously false.

Of course, this actually changes how automap works.

The assignment is currently only done on the toplevel, x[*][*] =
x[*][*]+1 still works just fine, but it has some similarities with the
previous situation, the arrays in the toplevel array will be swapped,
not altered.

this will be fixed soonish(tm)