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G'day Rolf, "°) came into core with 5.20.0 i.e. since May 27, 2014. So only new for oldies like me ;-)" Just noting that https://perldoc.perl.org/5.20.0/List::Util confirms this; however, https://perldoc.perl.org/5.34.1/List::Util has "Since version 1.29." for both pairgrep and pairmap. I recalled doing some limited investigation into this last month: "Re: Dancer app works until I run it with Plack::Handler::Apache2" (see the last two dot points under "Other suggestions:"). I now note that https://perldoc.perl.org/5.34.1/List::Util#KNOWN-BUGS lists "RT #95409" while https://perldoc.perl.org/5.20.0/List::Util#KNOWN-BUGS does not. There are quite a few other functions with "Since version 1.xx." — probably worth checking when List::Util is used; especially if bugs are detected or unexpected behaviours are encountered. — Ken In reply to Re^2: How to grep for values & see the keys?
by kcott
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