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  1. or download this
    my @fib4_cache;
    sub fib4 {
    ...
    fib3 2073455/s 2338415%     843%       --     -19%
    fib4 2551114/s 2877136%    1060%      23%       --
    
  2. or download this
    
    cmpthese(-1, {
    ...
    fib2  223254/s  255377%       --     -89%     -91%
    fib3 2071504/s 2370384%     828%       --     -20%
    fib4 2579867/s 2952119%    1056%      25%       --
    
  3. or download this
    my @fib5_cache;
    sub fib5 {
    ...
    fib4 2478824/s 2785096%    1035%      23%       --      -2%
    fib5 2537045/s 2850512%    1061%      25%       2%       --