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Quoth Alexey Malyshev <malma@kaluga.net>, on 2010-11-20 16:34:37 +0300:
> What's wrong with this code?

Nothing's "wrong" with it except that floating-point arithmetic isn't
doing what you expect but rather what it naturally does.

string.format('%.16f', 1+0.2+0.2+0.2+0.2+0.2)
  ==> "1.9999999999999998"

Go look on the Web regarding how binary fixed-precision floating-point
arithmetic often trips up people who are used to decimal arithmetic.

   ---> Drake Wilson