perldelta for cfc7ef1

[perl5.git] / pod / perldelta.pod

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 4418bba..1d8ad2f 100644 (file)
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -27,6 +27,15 @@ here, but most should go in the L</Performance Enhancements> section.
 
 [ List each enhancement as a =head2 entry ]
 
+=head2 Infinity and NaN (not-a-number) handling improved
+
+Floating point values are able to hold the special values infinity
+(also -infinity), and NaN (not-a-number).  Now we more robustly recognize
+and propagate the value in computations, and on output normalize them
+to C<Inf> and C<NaN>.
+
+See also the L<POSIX> enhancements.
+
 =head1 Security
 
 XXX Any security-related notices go here.  In particular, any security
@@ -45,6 +54,23 @@ XXX For a release on a stable branch, this section aspires to be:
 
 [ List each incompatible change as a =head2 entry ]
 
+=head2 Changes to the C<*> prototype
+
+The C<*> character in a subroutine's prototype used to allow barewords
+to take precedence over most, but not all subroutines.  It was never
+consistent and exhibited buggy behaviour.
+
+Now it has been changed, so subroutines always take precedence over
+barewords, which brings it into conformity with similarly prototyped
+built-in functions:
+
+    sub splat($) { ... }
+    sub foo { ... }
+    splat(foo); # now always splat(foo())
+    splat(bar); # still splat('bar') as before
+    close(foo); # close(foo())
+    close(bar); # close('bar')
+
 =head1 Deprecations
 
 XXX Any deprecated features, syntax, modules etc. should be listed here.
@@ -168,6 +194,9 @@ L<Module::CoreList> has been upgraded from version 5.021003 to 5.021004.
 
 L<POSIX> has been upgraded from version 1.42 to 1.43.
 
+The C99 math functions and constants (for example acosh, round,
+M_E, M_PI) have been added.
+
 =item *
 
 L<Pod::Perldoc> has been upgraded from version 3.23 to 3.24.
@@ -518,6 +547,28 @@ The parser no longer gets confused by C<\U=> within a double-quoted string.
 It used to roduce a syntax error, but now compiles it correctly.
 [perl #80368]
 
+=item *
+
+It has always been the intention for the C<-B> and C<-T> file test
+operators to treat UTF-8 encoded files as text.
+(L<perlfunc|perlfunc/-X FILEHANDLE> has been updated to say this.)
+Previously, it was possible for some files to be considered UTF-8 that
+actually weren't valid UTF-8.  This is now fixed.  The operators now
+work on EBCDIC platforms as well.
+
+=item *
+
+Under some conditions warning messages raised during regular expression
+pattern compilation were being output more than once.  This has now been
+fixed.
+
+=item *
+
+A regression has been fixed that was introduced in v5.20.0 (fixed in
+v5.20.1 as well as here) in which a UTF-8 encoded regular expression
+pattern that contains a single ASCII lowercase letter does not match its
+uppercase counterpart. [perl #122655]
+
 =back
 
 =head1 Known Problems