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#!/usr/bin/env perl 
use v5.36;
...
    my $range_aref = $c_ref->( $aref, $start, $stop );
    return join '', @$range_aref;
}

              Rate use_splice  use_slice
use_splice 33810/s         --       -39%
...
ok 58 - Testing: [7:-5] expecting ()
ok 59 - Testing: [3:4] expecting (d)
ok 60 - Testing: [0:12] expecting (abcdefghijk)