There have been a few discussions on this topic before, and some of them tend to turn a bit nasty :)
You see, there are a lot of people who like the "quick and dirty" nature of Perl. They don't want strictures on by default, because it will add an extra line to their code. I can understand this for one liners from the command line, but having strictures on by default would not really inconvenience too many people, and the benefits would far outweigh the positives.
In any case, it wouldn't be a good idea to add this into Perl 5, because it would break too much legacy code. However, Perl 6 - AFAIK - has strictures on by default (not sure about warnings, but I don't see any real reason why this wouldn't be a good idea too).
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