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  1. or download this
    C:\Perl64\packages>gunzip Readonly-XS-1.05.tar.gz

...
Installing C:\Perl64\site\lib\auto\Readonly\XS\XS.pdb
Installing C:\Perl64\site\lib\Readonly\XS.pm
Appending installation info to C:\Perl64\lib/perllocal.pod
  2. or download this
    #! perl -slw
use strict;
...
    literals => sub{ usingLiterals() },
    Readonly => sub{ usingReadonly() },
};
  3. or download this
    c:\test>ROvCONST.pl
           Rate Readonly literals    const
Readonly 4.06/s       --     -44%     -49%
literals 7.21/s      78%       --      -9%
const    7.90/s      95%      10%       --