Used module Readonly at line 9, column 3.  Readonly.pm is buggy and slow. Use Const::Fast or ReadonlyX instead, or the core pragma constant.  (Severity: 2)

##</code><code>##

Benchmark: timing 10000000 iterations of const, literal, normal, ro, ro_simple, rotie, tglob...
     const:  0 wallclock secs ( 0.37 usr +  0.00 sys =  0.37 CPU) @ 27027027.03/s (n=10000000)
            (warning: too few iterations for a reliable count)
   literal:  0 wallclock secs ( 0.37 usr +  0.00 sys =  0.37 CPU) @ 27027027.03/s (n=10000000)
            (warning: too few iterations for a reliable count)
    normal:  0 wallclock secs ( 0.40 usr +  0.00 sys =  0.40 CPU) @ 25000000.00/s (n=10000000)
        <b>ro:  1 wallclock secs ( 0.90 usr +  0.00 sys =  0.90 CPU) @ 11111111.11/s (n=10000000)</b>
 ro_simple:  5 wallclock secs ( 5.71 usr +  0.00 sys =  5.71 CPU) @ 1751313.49/s (n=10000000)
     rotie:  5 wallclock secs ( 4.68 usr +  0.00 sys =  4.68 CPU) @ 2136752.14/s (n=10000000)
     tglob:  1 wallclock secs ( 0.66 usr +  0.00 sys =  0.66 CPU) @ 15151515.15/s (n=10000000)

##</code><code>##

Benchmark: timing 10000000 iterations of const, literal, normal, ro, ro_simple, rotie, tglob...
     const:  0 wallclock secs ( 0.34 usr +  0.00 sys =  0.34 CPU) @ 29411764.71/s (n=10000000)
            (warning: too few iterations for a reliable count)
   literal:  0 wallclock secs ( 0.38 usr +  0.00 sys =  0.38 CPU) @ 26315789.47/s (n=10000000)
            (warning: too few iterations for a reliable count)
    normal:  0 wallclock secs ( 0.49 usr +  0.00 sys =  0.49 CPU) @ 20408163.27/s (n=10000000)
        <b>ro:  1 wallclock secs ( 0.42 usr +  0.00 sys =  0.42 CPU) @ 23809523.81/s (n=10000000)</b>
 ro_simple:  2 wallclock secs ( 0.45 usr +  0.00 sys =  0.45 CPU) @ 22222222.22/s (n=10000000)
     rotie:  1 wallclock secs ( 0.76 usr +  0.00 sys =  0.76 CPU) @ 13157894.74/s (n=10000000)
     tglob:  0 wallclock secs ( 0.59 usr +  0.00 sys =  0.59 CPU) @ 16949152.54/s (n=10000000)

##</code><code>##

package Boo;
# some module I don't control from CPAN

use strict;
use warnings;
use Readonly;

Readonly::Scalar our $BOO => 'boo';

1;

##</code><code>##

use strict;
use warnings

use ReadonlyX;  # take the advice of perlcritic!

use Boo; # this module uses Readonly

Readonly::Scalar my $FOO => 'bar';

##</code><code>##

perl -I . foo.pl
Prototype mismatch: sub Readonly::Scalar ($;$) vs ($$) at /usr/share/perl5/Readonly.pm line 257.
Prototype mismatch: sub Readonly::Scalar ($;$) vs ($$) at /usr/share/perl5/Readonly.pm line 343.
Prototype mismatch: sub Readonly::Readonly (\[%@$]$) vs (\[$@%]@) at (eval 7) line 42.Management is only worried about my (our) code...not other CPAN modules that use Readonly

##</code><code>##

use strict;
use warnings;

BEGIN {
  use Module::Loaded;

  use ReadonlyX;

  mark_as_loaded('Readonly');
}

use Boo;

Readonly::Scalar my $FOO => 'bar';

##</code><code>##

package Boo;

use strict;
use warnings;

use File::BOM;

1;

##</code><code>##

perl  -I . foo.pl
Useless use of reverse in void context at /home/rclauer/lib/perl5/File/BOM.pm line 205.
Odd number of elements in hash assignment at /home/rclauer/lib/perl5/File/BOM.pm line 187.
Compilation failed in require at Boo.pm line 6.
BEGIN failed--compilation aborted at Boo.pm line 6.
Compilation failed in require at foo.pl line 12.
BEGIN failed--compilation aborted at foo.pl line 12.