Others have already told you the clean way to do this (using anonymous hashes), but when you enter the first function you can first do

local *globHash;
[download]

and leave all else the same. This replaces the global typeglob with a new temporary replacement, your sub runs, pushes the ref the array, and then returns, replacing the original global. You then run again and get a new typeglob, etc.

Not the best way, but it works.