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$ perl -e'printf "%d\n", $_ for 4.9999999999, 5'
4
5

$ perl -e'printf "%.0f\n", $_ for 4.9999999999, 5'
5
5

$ perl -e'printf "%.0f\n", $_ for 5.4999999999, 5.5'
5
6

$ perl -e'printf "%.0f\n", sprintf "%.8f", $_ for 5.4999999999, 5.5'
6
6