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sub by_alias { $_[0]  =~ s/\s+//; }
sub by_alias2 { for ($_[0]) { s/\s+//; } }
sub by_alias3 { ${\$_[0]} =~ s/\s+//; }
sub by_ref { ${ $_[0] } =~ s/\s+//; }
sub by_ref2 { for (${ $_[0] }) { s/\s+//; } }

Length of string: 130000
          Rate  alias   ref2 alias2    ref alias3
alias  17544/s     --   -67%   -67%   -68%   -68%
...
ref2    1379/s     0%     0%     --    -0%   -92%
ref     1381/s     0%     0%     0%     --   -92%
alias  16393/s  1092%  1090%  1089%  1087%     --