The problem with my situation was simple, and no one thought of it or caught it, including me. I had

use strict;

in effect, which includes

use strict 'refs';

No dice on the sort subroutine's reference under those conditions. Sorry for the turmoil. I'll go back into my hole in the wall now.

In reply to Re: Dynamic sort algorithm selection by Sentinel
in thread Dynamic sort algorithm selection by Sentinel

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