<s>sprintf and printf no longer rounds sometime after Perl 5.8.8. It truncates. </s>
EDIT: I think I may have some bad information, which was corrected later on. If a calculation is done which results in 2.4999999999, sprintf("%.2f",2.49999999) would "round" to 2.49 for some reason, which appears to be truncation, but is actually a different problem. You may not be able to reproduce the problem by typing in 2.4999999. 2.49999999 has to be the result of a calculation.
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$ perl -wE 'printf "%.3f\n", .0009 + $];'
5.023
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
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[d/l]
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