Boolean context does not first convert the scalar to a number
Ah, I see.
No, at least part of your testing was flawed. "0 ", "0\n", "00", and even "0.0" are all true values. The only false values are "" and "0", period.
perl -e "print (0+qq(0 )?'true':'false')"
perl -e "print (qq(0\n)?'true':'false')"
What am I doing wrong? It looks like "0 " is indeed false, while "0\n" is true.
Update: I didn't notice I still had the 0+ in there. I tried a bunch of variations. That's what I get for experimenting at 2am!
—John
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