This is the revision history for /o in <*:##NULL>

factoid_idsubjectcopulapredicateauthornamespace
14597 /o is /o isn't what you want. It's to pretend to optimize your code, but actually introduces bugs. See perldoc perlop or https://perldoc.pl/perlop#/PATTERN/msixpodualngc simcop2387
12543 /o is /o isn't what you want. See perldoc perlop or http://perldoc.perl.org/perlop.html#/_PATTERN_/msixpodualngc simcop2387
12542 /o is useless pink_mist