+=head2 C<_> in subroutine prototypes
+
+The C<_> character in subroutine prototypes is now allowed before C<@> or
+C<%>.
+
+=head2 Supports (I<almost>) Unicode 6.1
+
+Besides the addition of whole new scripts, and new characters in
+existing scripts, this new version of Unicode, as always, makes some
+changes to existing characters. One change that may trip up some
+applications is that the General Category of two characters in the
+Latin-1 range, PILCROW SIGN and SECTION SIGN, has been changed from
+Other_Symbol to Other_Punctuation. The same change has been made for
+a character in each of Tibetan, Ethiopic, and Aegean.
+The code points U+3248..U+324F (CIRCLED NUMBER TEN ON BLACK SQUARE
+through CIRCLED NUMBER EIGHTY ON BLACK SQUARE) have had their General
+Category changed from Other_Symbol to Other_Numeric. The Line Break
+property has changes for Hebrew and Japanese; and as a consequence of
+other changes in 6.1, the Perl regular expression construct C<\X> now
+works differently for some characters in Thai and Lao.
+
+New aliases (synonyms) have been defined for many property values;
+these, along with the previously existing ones, are all cross indexed in
+L<perluniprops>.
+
+The return value of C<charnames::viacode> is affected by other changes.
+One of these is that the preferred name (which is what C<viacode>
+returns) for the character at U+2118 has been changed from SCRIPT CAPITAL P
+to WEIERSTRASS ELLIPTIC FUNCTION. But most of these changes are the
+fallout of the mistake Unicode 6.0 made in naming a character used in
+Japanese cell phones to be "BELL", which conflicts with the long
+standing industry use of (and Unicode's recommendation to use) that name
+to mean the ASCII control character at U+0007. As a result, that name
+has been deprecated in Perl since v5.14; and any use of it will raise a
+warning message (unless turned off). The name "ALERT" is now the
+preferred name for this code point, with "BEL" being an acceptable short
+form. The name for the new cell phone character, at code point U+1F514,
+remains undefined in this version of Perl (hence we don't quite
+implement all of Unicode 6.1), but starting in v5.18, BELL will mean
+this character, and not U+0007.
+
+Unicode has taken steps to make sure that this sort of mistake does not
+happen again. The Standard now includes all the generally accepted
+names and abbreviations for control characters, whereas previously it
+didn't. This means that all the names that Perl had previously
+deprecated (except BELL) are no longer deprecated, such as FILE
+SEPARATOR. Also, the names for four rarely used characters are subtly
+different (a hyphen instead of a space) than before:
+
+ Code point Old Name New Name
+ U+008E SINGLE-SHIFT 2 SINGLE-SHIFT-2
+ U+008F SINGLE-SHIFT 3 SINGLE-SHIFT-3
+ U+0091 PRIVATE USE 1 PRIVATE USE-1
+ U+0092 PRIVATE USE 2 PRIVATE USE-2
+
+Perl will accept either name as input, but C<charnames::viacode> now
+returns the new name.
+
+Additional name abbreviations are accepted:
+SP for SPACE;
+TAB for CHARACTER TABULATION;
+NEW LINE, END OF LINE, NL, and EOL for LINE FEED;
+LOCKING-SHIFT ONE for SHIFT OUT;
+LOCKING-SHIFT ZERO for SHIFT IN;
+and ZWNBSP for ZERO WIDTH NO-BREAK SPACE.
+
+More details on this version of Unicode are provided in
+L<http://www.unicode.org/versions/Unicode6.1.0/>.
+
+=head2 Added C<is_utf8_char_buf()>
+
+This function is designed to replace the deprecated L</is_utf8_char()>
+function. It includes an extra parameter to make sure it doesn't read
+past the end of the input buffer.
+