This pragma affects utf8::upgrade, but not utf8::downgrade.
-=head2 Side effects
-
-If the C<encoding> pragma is in scope then the lengths returned are
-calculated from the length of C<$/> in Unicode characters, which is not
-always the same as the length of C<$/> in the native encoding.
-
-This pragma affects utf8::upgrade, but not utf8::downgrade.
-
-=head2 Side effects
-
-If the C<encoding> pragma is in scope then the lengths returned are
-calculated from the length of C<$/> in Unicode characters, which is not
-always the same as the length of C<$/> in the native encoding.
-
-This pragma affects utf8::upgrade, but not utf8::downgrade.
-
=head1 FEATURES THAT REQUIRE 5.8.1
Some of the features offered by this pragma requires perl 5.8.1. Most