I don't know when it was fixed, but it's fixed in 5.8.8. 
>perl580\bin\perl -we"$cur[2]=20; $win[2]=100; $sec[2]=undef; if ($cur
+[2] > $win[2]) {}" -e"elsif (0+$cur[2] > 0+$sec[2]) {}"
Use of uninitialized value in addition (+) at -e line 1.

>perl588\bin\perl -we"$cur[2]=20; $win[2]=100; $sec[2]=undef; if ($cur
+[2] > $win[2]) {}" -e"elsif (0+$cur[2] > 0+$sec[2]) {}"
Use of uninitialized value in addition (+) at -e line 2.

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In reply to Re^2: Unknown Arithmetic Warning: Cannot determine source by ikegami
in thread Unknown Arithmetic Warning: Cannot determine source by mpettis

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