$ perl -e 'print [0,1,2,3,4]->[0+"inf"]'
4
$ perl -e 'print [0,1,2,3,4]->[0+"-inf"]'
0
$ perl -e 'print [0,1,2,3,4]->[0+"nan"]'
0
$ perl -e 'print [0,1,2,3,4]->[0+"hoge"]'
0
$ perl -e 'print [0,1,2,3,4]->[-0**1]'
0
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