Benchmark: timing 10000 iterations of Assert, Assert2, IfBlocks, IfStatement, UnlessBlocks, UnlessStatement...
         Assert:  4 wallclock secs ( 2.38 usr +  0.02 sys =  2.40 CPU) @ 4166.67/s (n=10000)
        Assert2:  4 wallclock secs ( 2.36 usr +  0.03 sys =  2.39 CPU) @ 4184.10/s (n=10000)
       IfBlocks: 13 wallclock secs ( 7.82 usr +  0.13 sys =  7.95 CPU) @ 1257.86/s (n=10000)
    IfStatement: 13 wallclock secs ( 7.69 usr +  0.01 sys =  7.70 CPU) @ 1298.70/s (n=10000)
   UnlessBlocks: 12 wallclock secs (10.68 usr +  0.80 sys = 11.48 CPU) @ 871.08/s  (n=10000)
UnlessStatement: 11 wallclock secs (11.67 usr +  0.05 sys = 11.72 CPU) @ 853.24/s  (n=10000)
                  Rate UnlessStatement UnlessBlocks IfBlocks IfStatement Assert Assert2
UnlessStatement  853/s              --          -2%     -32%        -34%   -80%    -80%
UnlessBlocks     871/s              2%           --     -31%        -33%   -79%    -79%
IfBlocks        1258/s             47%          44%       --         -3%   -70%    -70%
IfStatement     1299/s             52%          49%       3%          --   -69%    -69%
Assert          4167/s            388%         378%     231%        221%     --     -0%
Assert2         4184/s            390%         380%     233%        222%     0%      --