Autoload charnames for \N{name}

This autoloads charnames.pm when needed.  It uses the :full and :short
options.  :loose is not used because of its relative unfamiliarity in
the Perl community, and is slower.  (If someone later added a typical
"use charnames qw(:full)", things that previously matched under :loose
would start to fail, causing confustion.  If :loose does become more
common, we can change this in the future to use it; the converse isn't
true.)

The callable functions in the module are not automatically loaded.  To
access them, an explicity "use charnames" must be provided.

Thanks to Tony Cook for doing a code inspection and finding a missing
SPAGAIN.

1 files changed, 8 insertions, 7 deletions

diff --git a/pod/perlunicode.pod b/pod/perlunicode.pod
index 2529c97523..d6dc222121 100644
--- a/pod/perlunicode.pod
+++ b/pod/perlunicode.pod
@@ -158,13 +158,14 @@ the additional problem that the value for such characters gives the EBCDIC
 character rather than the Unicode one, thus it is more portable to use
 C<\N{U+...}> instead.
 
-Additionally, if you
-
-   use charnames ':full';
-
-you can use the C<\N{...}> notation and put the official Unicode
-character name within the braces, such as C<\N{WHITE SMILING FACE}>.
-See L<charnames>.
+Additionally, you can use the C<\N{...}> notation and put the official
+Unicode character name within the braces, such as
+C<\N{WHITE SMILING FACE}>.  This automatically loads the L<charnames>
+module with the C<:full> and C<:short> options.  If you prefer different
+options for this module, you can instead, before the C<\N{...}>,
+explicitly load it with your desired options; for example,
+
+   use charnames ':loose';
 
 =item *