I'm using rather often List::Util lately. I noticed that sum returns undef on an empty list: 

$ perl -w -MList::Util=sum -le 'print sum'
Use of uninitialized value in print at -e line 1.

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Mathematically, it makes much more sense to return 0. Failing to do so forces me to either || 0 or use no warnings 'uninitialized'; and I wonder whether changing its behaviour is likely to break anything, although that seems highly improbable to me.

In reply to List::Util::sum() and empty lists... by blazar

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