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  my $subcode = sub { for (1 .. $n) { local \$_; package $pack; $c;} }
  my $subref = eval $subcode;
  &$subref

package R; # Just to demonstrate a variable in another package
my $R = 10;
...
my $subcode = "sub { local \$_; package R; print $R}";
my $subref  = eval $subcode;
&$subref;

Benchmark: timing 1000 iterations of Grep, Max, Ternary...
      Grep: 20 wallclock secs (19.99 usr +  0.03 sys = 20.02 CPU)
       Max: 22 wallclock secs (21.69 usr +  0.03 sys = 21.72 CPU)
   Ternary: 22 wallclock secs (22.58 usr +  0.00 sys = 22.58 CPU)