will do an implicit
+ no feature;
use feature ':5.10';
and so on. Note how the trailing sub-version is automatically stripped from the
with the same effect.
+For versions below 5.010, the ":default" feature bundle is automatically
+loaded, but it is currently empty and has no effect.
+
=back
=cut
C<use>ing library modules that won't work with older versions of Perl.
(We try not to do this more than we have to.)
-Also, if the specified Perl version is greater than or equal to 5.9.5,
-C<use VERSION> will also load the C<feature> pragma and enable all
-features available in the requested version. See L<feature>.
+C<use VERSION> also loads the C<feature> pragma and enables all features
+available in the requested version, disabling any features not in
+the current version's feature bundle. See L<feature>. (Whether
+it actually loads the F<feature.pm> module is subject to
+change. In some cases it is skipped for efficiency reasons.)
Similarly, if the specified Perl version is greater than or equal to
5.11.0, strictures are enabled lexically as with C<use strict> (except
-that the F<strict.pm> file is not actually loaded).
+that the F<strict.pm> file is not actually loaded). Any explicit use of
+C<use strict> or C<no strict> overrides C<use VERSION>, even if it comes
+before it.
The C<BEGIN> forces the C<require> and C<import> to happen at compile time. The
C<require> makes sure the module is loaded into memory if it hasn't been