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> Several of the results surprised me. Did they surprise you?

Well, the perl6 result surprised me, since that means it's using something more precise than double precision floating point :)

They're called Rat (for Rational number): https://docs.perl6.org/type/Rat , which maintain precision until the denominator exceeds 64 bits: then they're downgraded to doubles. If you want to keep precision still at that level, you can use FatRat: https://docs.perl6.org/type/FatRat

It surprised me too, since it's not what I got.

    $ perl6 --version
    This is Rakudo version 2018.03 built on MoarVM version 2018.03
    implementing Perl 6.c.
    $ perl6 -e 'print 9999999999999999.0-9999999999999998.0;print "\n";'
(Incidentally, I would have used "say" rather than "print" with an explicit newline.)

Indeed, there was a bug with determining when to switch to floats, that was fixed by Zoffix in August:


  › perl6 -e '.say for $*PERL.compiler, 9999999999999999.0-9999999999999998.0'
  rakudo (2018.11)

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