So *b = *a copies those pointers, and undef *a wipes out the original collection of pointers, but not the copy.
That is not true, typeglob assignment performs an aliasing operation:
$x = 10;
@x = qw(1 2 3);
*y = *x;
$x = 12;
print $y; # <- Prints 12
print $y; # <- Warns "Use of uninitialized value in..."
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