My only problem is a lack of full understanding. If I only sort of think I get it, I'll screw something up. :)

For example, I can't say

  my @x;
  local @x;

because local requires a package variable such as @::x to localize, and my @x isn't in any package, because it's lexical. But I *can* say

  my @x;
  local $x[0];

What's going on there? I just need an explanation of the magic that's handling that, because otherwise I have no clue what's happening, and the world becomes a dark and mysterious place. :)