$ perl5.8.9 foo
Use of implicit split to @_ is deprecated at foo line 65.
Use of implicit split to @_ is deprecated at foo line 91.
Use of implicit split to @_ is deprecated at foo line 101.
                      Rate end_of_substring   all tr_and_end end_slurped split while tr_and_split_redux tr_and_split tr_moar_magic
end_of_substring    3911/s               --  -17%       -18%        -21%  -47%  -57%               -72%         -73%          -93%
all                 4686/s              20%    --        -2%         -6%  -36%  -49%               -66%         -67%          -92%
tr_and_end          4796/s              23%    2%         --         -3%  -35%  -47%               -65%         -66%          -92%
end_slurped         4960/s              27%    6%         3%          --  -32%  -45%               -64%         -65%          -91%
split               7348/s              88%   57%        53%         48%    --  -19%               -47%         -48%          -87%
while               9099/s             133%   94%        90%         83%   24%    --               -34%         -36%          -84%
tr_and_split_redux 13831/s             254%  195%       188%        179%   88%   52%                 --          -3%          -76%
tr_and_split       14245/s             264%  204%       197%        187%   94%   57%                 3%           --          -75%
tr_moar_magic      57803/s            1378% 1134%      1105%       1065%  687%  535%               318%         306%            --