Problem in filtering of user input.
For example. User try to make bid at auction, and enter NaN in "price" field. All standart methods like: $price = sprintf("%.2f", $price); return me NaN But it not so bad. Really bad is: 
if ($price > $user_money) {
   return "You have not enough money". 
}

[download]

Will fail for NaN. I found about 30 "nan holes" in my code after 5.8.4, and I suppose, I found not all of it.

P.S. Sorry for my bad english.

In reply to Re^2: Q: NaN again by kai
in thread Q: NaN again by Anonymous Monk

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