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"new" always comes out faster in Identical code runs

Got this:

use Benchy;
b 1000, { do(); say 'hello' },
     { do(); say 'hello' },
        { do(); } ;

sub do {
    return;
}

Get this:

Bare: 0.00074653s
Old:  0.004277664s
New:  0.00308324s
NEW version is 38% faster

Some more complicated code can say "New version is 5x faster" even though it's the same code.

Fix division by zero

zoffix@leliana~$ perl6 -MBenchy -e 'b 500000, {;}, {;}'
Bare: 0.1243830702788s
Old:  0s
New:  0.0080373593521098327s
Attempt to divide 0.00803735935210983 by zero using /
  in sub dif at /home/zoffix/.rakudobrew/moar-nom/install/share/perl6/site/sources/78016467205BC2F8076A1E3313B1E46274603615 (Benchy) line 57
  in block  at /home/zoffix/.rakudobrew/moar-nom/install/share/perl6/site/sources/78016467205BC2F8076A1E3313B1E46274603615 (Benchy) line 65
  in sub b at /home/zoffix/.rakudobrew/moar-nom/install/share/perl6/site/sources/78016467205BC2F8076A1E3313B1E46274603615 (Benchy) line 63
  in block <unit> at -e line 1

Actually thrown at:
  in sub dif at /home/zoffix/.rakudobrew/moar-nom/install/share/perl6/site/sources/78016467205BC2F8076A1E3313B1E46274603615 (Benchy) line 58
  in block  at /home/zoffix/.rakudobrew/moar-nom/install/share/perl6/site/sources/78016467205BC2F8076A1E3313B1E46274603615 (Benchy) line 65
  in sub b at /home/zoffix/.rakudobrew/moar-nom/install/share/perl6/site/sources/78016467205BC2F8076A1E3313B1E46274603615 (Benchy) line 63
  in block <unit> at -e line 1

zoffix@leliana~$

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