I want to parse a hex-ascii string into an array of numbers. For
example:

"0164" => [1,100]

Essentially I need to iterate through character pairs and use
String#hex:

"01".hex => 1
"64".hex => 100

I can do this easily enough in "C style" with an index into the string,
i.e. equivalent to a C "for" loop. But I'm interested in solutions that
are more in the "Ruby style," using an iterator.

Suggestions?

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