I'm assuming that's producing a Schwartzian Transform. The benefit of the Guttman-Rosler Transform (which I've employed) is that it uses 'sort' instead of 'sort { ... }'. However, speed really isn't an issue here (nor should it be).
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I'm assuming that's producing a Schwartzian Transform.
No, Sort::Key is implemented in C so it doesn't have to use nasty tricks to avoid calling perl code inside the sorting algorithm. And it is faster than the GRT most of the times.