Here's my Hole 4, though I feel as if I must be missing something
obvious, either incorrect in my answer or a different solution.
sub h2c{split//,pack"H*",pop}
123456789_123456789_
20 characters.
Update: I realize now that the answer is incorrect because it returns a string rather than a list. Thanks all. :)
Update again: Fixed the answer by adding the split.
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