in reply to
It will come "free" with use 5.11; onwards.
From use in http://perl5.git.perl.org/perl.git/blob_plain/HEAD:/pod/perl5114delta.pod:
Also, if the specified Perl version is greater than or equal to 5.9.5, "use VERSION" will also
load the "feature" pragma and enable all features available in the requested version. See
feature. Similarly, if the specified Perl version is greater than or equal to 5.11.0,
strictures are enabled lexically as with "use strict" (except that the strict.pm file is not