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timethese(1000000, {
    'blessed' => sub { my $bar = $foo; $c->clean($foo); },
    'normal'  => sub { my $bar = $foo; $bar =~ s/^\s+|\s$//g; },
    'super' => sub { my $bar = $foo; $bar =~ s/$c//g; },
});

Benchmark: timing 1000000 iterations of blessed, normal, super...
   blessed: 10 wallclock secs ( 9.83 usr +  0.00 sys =  9.83 CPU)
    normal:  4 wallclock secs ( 5.42 usr +  0.00 sys =  5.42 CPU)
     super:  7 wallclock secs ( 6.71 usr +  0.00 sys =  6.71 CPU)