Autovivifying values into @_. I would never have thought of doing that... And I certainly didn't interprete your code as doing so, though it is obviously what is happening now you've pointed it out.
Mind you, I'm not exactly Mr.Paranoid in these matters, but just because you can, doesn't mean you should--leastwise not until I've found a good use for it, in which case it will be perfectly okay :)
In reply to Re^9: Sorting, recursion, and tail-call optimizations
by BrowserUk
in thread Sorting, recursion, and tail-call optimizations
by Limbic~Region
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