diff options
Diffstat (limited to 'pod')
| -rw-r--r-- | pod/perlfunc.pod | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/pod/perlfunc.pod b/pod/perlfunc.pod index 676644f732..08b9df9e82 100644 --- a/pod/perlfunc.pod +++ b/pod/perlfunc.pod @@ -2174,8 +2174,16 @@ Case Charts available at L<http://www.unicode.org/charts/case/>. If EXPR is omitted, uses C<$_>. -This function behaves the same way under various pragma, such as in a locale, -as L</lc> does. +This function behaves the same way under various pragma, such as within +S<C<"use feature 'unicode_strings">>, as L</lc> does, with the single +exception of C<fc> of LATIN CAPITAL LETTER SHARP S (U+1E9E) within the +scope of S<C<use locale>>. The foldcase of this character would +normally be C<"ss">, but as explained in the L</lc> section, case +changes that cross the 255/256 boundary are problematic under locales, +and are hence prohibited. Therefore, this function under locale returns +instead the string C<"\x{17F}\x{17F}">, which is the LATIN SMALL LETTER +LONG S. Since that character itself folds to C<"s">, the string of two +of them together should be equivalent to a single U+1E9E when foldcased. While the Unicode Standard defines two additional forms of casefolding, one for Turkic languages and one that never maps one character into multiple |