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`use v5.30` is equivalent to `use v5.30.0` and [automatically enables strictures](https://perldoc.perl.org/functions/use#use-VERSION) `use experimental 'signatures'` enables the feature and disables its experimental warnings in one step; [this pragma](https://perldoc.perl.org/experimental) has been [included since Perl v5.20](https://perldoc.perl.org/perl5200delta#New-Modules-and-Pragmata) when signatures were also introduced
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use v5.30is equivalent touse v5.30.0and automatically enables strictures.use 5.30.0is incorrect syntax; a v-string needs to lead with av. If you want to use plain numeric arguments it would use the formuse 5.030000but that is considered less readable syntax and only needed for compatibility with Perls older than 2002’s v5.8.0. See theusefunction docs for more.use experimental 'signatures'enables the feature and disables its experimental warnings in one step; this pragma has been included since Perl v5.20 when signatures were also introduced.