Create new perldelta for 5.26.4

11 files changed, 511 insertions, 86 deletions

diff --git a/MANIFEST b/MANIFEST
index 22905e59ea..52eb647503 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -4943,6 +4943,7 @@ pod/perl5244delta.pod		Perl changes in version 5.24.4
 pod/perl5260delta.pod		Perl changes in version 5.26.0
 pod/perl5261delta.pod		Perl changes in version 5.26.1
 pod/perl5262delta.pod		Perl changes in version 5.26.2
+pod/perl5263delta.pod		Perl changes in version 5.26.3
 pod/perl5280delta.pod		Perl changes in version 5.28.0
 pod/perl561delta.pod		Perl changes in version 5.6.1
 pod/perl56delta.pod		Perl changes in version 5.6
diff --git a/Makefile.SH b/Makefile.SH
index 2431e748b4..58b6441c32 100755
--- a/Makefile.SH
+++ b/Makefile.SH
@@ -570,7 +570,7 @@ esac
 
 $spitshell >>$Makefile <<'!NO!SUBS!'
 
-perltoc_pod_prereqs = extra.pods pod/perl5263delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
+perltoc_pod_prereqs = extra.pods pod/perl5264delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod
 generated_pods = pod/perltoc.pod $(perltoc_pod_prereqs)
 generated_headers = uudmap.h bitcount.h mg_data.h
 
@@ -1120,9 +1120,9 @@ pod/perlintern.pod: $(MINIPERL_EXE) autodoc.pl embed.fnc
 pod/perlmodlib.pod: $(MINIPERL_EXE) pod/perlmodlib.PL MANIFEST
 	$(MINIPERL) pod/perlmodlib.PL -q
 
-pod/perl5263delta.pod: pod/perldelta.pod
-	$(RMS) pod/perl5263delta.pod
-	$(LNS) perldelta.pod pod/perl5263delta.pod
+pod/perl5264delta.pod: pod/perldelta.pod
+	$(RMS) pod/perl5264delta.pod
+	$(LNS) perldelta.pod pod/perl5264delta.pod
 
 extra.pods: $(MINIPERL_EXE)
 	-@test ! -f extra.pods || rm -f `cat extra.pods`
diff --git a/pod/.gitignore b/pod/.gitignore
index fcf35a612b..d4a2e7f4d5 100644
--- a/pod/.gitignore
+++ b/pod/.gitignore
@@ -50,7 +50,7 @@
 /roffitall
 
 # generated
-/perl5263delta.pod
+/perl5264delta.pod
 /perlapi.pod
 /perlintern.pod
 /perlmodlib.pod
diff --git a/pod/perl.pod b/pod/perl.pod
index fbbb952b6b..cbe05b0bc4 100644
--- a/pod/perl.pod
+++ b/pod/perl.pod
@@ -182,6 +182,7 @@ aux h2ph h2xs perlbug pl2pm pod2html pod2man splain xsubpp
     perlhist		Perl history records
     perldelta		Perl changes since previous version
     perl5280delta	Perl changes in version 5.28.0
+    perl5263delta	Perl changes in version 5.26.3
     perl5262delta	Perl changes in version 5.26.2
     perl5261delta	Perl changes in version 5.26.1
     perl5260delta	Perl changes in version 5.26.0
diff --git a/pod/perl5263delta.pod b/pod/perl5263delta.pod
new file mode 100644
index 0000000000..43ec1f45a6
--- /dev/null
+++ b/pod/perl5263delta.pod
@@ -0,0 +1,201 @@
+=encoding utf8
+
+=head1 NAME
+
+perl5263delta - what is new for perl v5.26.3
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.26.2 release and the 5.26.3
+release.
+
+If you are upgrading from an earlier release such as 5.26.1, first read
+L<perl5262delta>, which describes differences between 5.26.1 and 5.26.2.
+
+=head1 Security
+
+=head2 [CVE-2018-12015] Directory traversal in module Archive::Tar
+
+By default, L<Archive::Tar> doesn't allow extracting files outside the current
+working directory.  However, this secure extraction mode could be bypassed by
+putting a symlink and a regular file with the same name into the tar file.
+
+L<[perl #133250]|https://rt.perl.org/Ticket/Display.html?id=133250>
+L<[cpan #125523]|https://rt.cpan.org/Ticket/Display.html?id=125523>
+
+=head2 [CVE-2018-18311] Integer overflow leading to buffer overflow and segmentation fault
+
+Integer arithmetic in C<Perl_my_setenv()> could wrap when the combined length
+of the environment variable name and value exceeded around 0x7fffffff.  This
+could lead to writing beyond the end of an allocated buffer with attacker
+supplied data.
+
+L<[perl #133204]|https://rt.perl.org/Ticket/Display.html?id=133204>
+
+=head2 [CVE-2018-18312] Heap-buffer-overflow write in S_regatom (regcomp.c)
+
+A crafted regular expression could cause heap-buffer-overflow write during
+compilation, potentially allowing arbitrary code execution.
+
+L<[perl #133423]|https://rt.perl.org/Ticket/Display.html?id=133423>
+
+=head2 [CVE-2018-18313] Heap-buffer-overflow read in S_grok_bslash_N (regcomp.c)
+
+A crafted regular expression could cause heap-buffer-overflow read during
+compilation, potentially leading to sensitive information being leaked.
+
+L<[perl #133192]|https://rt.perl.org/Ticket/Display.html?id=133192>
+
+=head2 [CVE-2018-18314] Heap-buffer-overflow write in S_regatom (regcomp.c)
+
+A crafted regular expression could cause heap-buffer-overflow write during
+compilation, potentially allowing arbitrary code execution.
+
+L<[perl #131649]|https://rt.perl.org/Ticket/Display.html?id=131649>
+
+=head1 Incompatible Changes
+
+There are no changes intentionally incompatible with 5.26.2.  If any exist,
+they are bugs, and we request that you submit a report.  See
+L</Reporting Bugs> below.
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules and Pragmata
+
+=over 4
+
+=item *
+
+L<Archive::Tar> has been upgraded from version 2.24 to 2.24_01.
+
+=item *
+
+L<Module::CoreList> has been upgraded from version 5.20180414_26 to 5.20181129_26.
+
+=back
+
+=head1 Diagnostics
+
+The following additions or changes have been made to diagnostic output,
+including warnings and fatal error messages.  For the complete list of
+diagnostic messages, see L<perldiag>.
+
+=head2 New Diagnostics
+
+=head3 New Errors
+
+=over 4
+
+=item *
+
+L<Unexpected ']' with no following ')' in (?[... in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Unexpected ']' with no following ')' in (?[... in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>">
+
+(F) While parsing an extended character class a ']' character was encountered
+at a point in the definition where the only legal use of ']' is to close the
+character class definition as part of a '])', you may have forgotten the close
+paren, or otherwise confused the parser.
+
+=item *
+
+L<Expecting close paren for nested extended charclass in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Expecting close paren for nested extended charclass in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>">
+
+(F) While parsing a nested extended character class like:
+
+    (?[ ... (?flags:(?[ ... ])) ... ])
+                             ^
+
+we expected to see a close paren ')' (marked by ^) but did not.
+
+=item *
+
+L<Expecting close paren for wrapper for nested extended charclass in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Expecting close paren for wrapper for nested extended charclass in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>">
+
+(F) While parsing a nested extended character class like:
+
+    (?[ ... (?flags:(?[ ... ])) ... ])
+                              ^
+
+we expected to see a close paren ')' (marked by ^) but did not.
+
+=back
+
+=head2 Changes to Existing Diagnostics
+
+=over 4
+
+=item *
+
+L<Syntax error in (?[...]) in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Syntax error in (?[...]) in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>">
+
+This fatal error message has been slightly expanded (from "Syntax error in
+(?[...]) in regex mE<sol>%sE<sol>") for greater clarity.
+
+=back
+
+=head1 Acknowledgements
+
+Perl 5.26.3 represents approximately 8 months of development since Perl 5.26.2
+and contains approximately 4,500 lines of changes across 51 files from 15
+authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 770 lines of changes to 10 .pm, .t, .c and .h files.
+
+Perl continues to flourish into its third decade thanks to a vibrant community
+of users and developers.  The following people are known to have contributed
+the improvements that became Perl 5.26.3:
+
+Aaron Crane, Abigail, Chris 'BinGOs' Williams, Dagfinn Ilmari Mannsåker, David
+Mitchell, H.Merijn Brand, James E Keenan, John SJ Anderson, Karen Etheridge,
+Karl Williamson, Sawyer X, Steve Hay, Todd Rinaldo, Tony Cook, Yves Orton.
+
+The list above is almost certainly incomplete as it is automatically generated
+from version control history.  In particular, it does not include the names of
+the (very much appreciated) contributors who reported issues to the Perl bug
+tracker.
+
+Many of the changes included in this version originated in the CPAN modules
+included in Perl's core.  We're grateful to the entire CPAN community for
+helping Perl to flourish.
+
+For a more complete list of all of Perl's historical contributors, please see
+the F<AUTHORS> file in the Perl source distribution.
+
+=head1 Reporting Bugs
+
+If you find what you think is a bug, you might check the perl bug database
+at L<https://rt.perl.org/> .  There may also be information at
+L<http://www.perl.org/> , the Perl Home Page.
+
+If you believe you have an unreported bug, please run the L<perlbug> program
+included with your release.  Be sure to trim your bug down to a tiny but
+sufficient test case.  Your bug report, along with the output of C<perl -V>,
+will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
+
+If the bug you are reporting has security implications which make it
+inappropriate to send to a publicly archived mailing list, then see
+L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
+for details of how to report the issue.
+
+=head1 Give Thanks
+
+If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
+you can do so by running the C<perlthanks> program:
+
+    perlthanks
+
+This will send an email to the Perl 5 Porters list with your show of thanks.
+
+=head1 SEE ALSO
+
+The F<Changes> file for an explanation of how to view exhaustive details on
+what changed.
+
+The F<INSTALL> file for how to build Perl.
+
+The F<README> file for general stuff.
+
+The F<Artistic> and F<Copying> files for copyright information.
+
+=cut
diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index bc94ddfbc0..07409956fb 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -2,76 +2,163 @@
 
 =head1 NAME
 
-perldelta - what is new for perl v5.26.3
+[ this is a template for a new perldelta file.  Any text flagged as XXX needs
+to be processed before release. ]
+
+perldelta - what is new for perl v5.26.4
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.26.2 release and the 5.26.3
+This document describes differences between the 5.26.3 release and the 5.26.4
 release.
 
-If you are upgrading from an earlier release such as 5.26.1, first read
-L<perl5262delta>, which describes differences between 5.26.1 and 5.26.2.
+If you are upgrading from an earlier release such as 5.26.2, first read
+L<perl5263delta>, which describes differences between 5.26.2 and 5.26.3.
+
+=head1 Notice
+
+XXX Any important notices here
+
+=head1 Core Enhancements
+
+XXX New core language features go here.  Summarize user-visible core language
+enhancements.  Particularly prominent performance optimisations could go
+here, but most should go in the L</Performance Enhancements> section.
+
+[ List each enhancement as a =head2 entry ]
 
 =head1 Security
 
-=head2 [CVE-2018-12015] Directory traversal in module Archive::Tar
+XXX Any security-related notices go here.  In particular, any security
+vulnerabilities closed should be noted here rather than in the
+L</Selected Bug Fixes> section.
 
-By default, L<Archive::Tar> doesn't allow extracting files outside the current
-working directory.  However, this secure extraction mode could be bypassed by
-putting a symlink and a regular file with the same name into the tar file.
+[ List each security issue as a =head2 entry ]
 
-L<[perl #133250]|https://rt.perl.org/Ticket/Display.html?id=133250>
-L<[cpan #125523]|https://rt.cpan.org/Ticket/Display.html?id=125523>
+=head1 Incompatible Changes
 
-=head2 [CVE-2018-18311] Integer overflow leading to buffer overflow and segmentation fault
+XXX For a release on a stable branch, this section aspires to be:
 
-Integer arithmetic in C<Perl_my_setenv()> could wrap when the combined length
-of the environment variable name and value exceeded around 0x7fffffff.  This
-could lead to writing beyond the end of an allocated buffer with attacker
-supplied data.
+    There are no changes intentionally incompatible with 5.XXX.XXX
+    If any exist, they are bugs, and we request that you submit a
+    report.  See L</Reporting Bugs> below.
 
-L<[perl #133204]|https://rt.perl.org/Ticket/Display.html?id=133204>
+[ List each incompatible change as a =head2 entry ]
 
-=head2 [CVE-2018-18312] Heap-buffer-overflow write in S_regatom (regcomp.c)
+=head1 Deprecations
 
-A crafted regular expression could cause heap-buffer-overflow write during
-compilation, potentially allowing arbitrary code execution.
+XXX Any deprecated features, syntax, modules etc. should be listed here.
 
-L<[perl #133423]|https://rt.perl.org/Ticket/Display.html?id=133423>
+=head2 Module removals
 
-=head2 [CVE-2018-18313] Heap-buffer-overflow read in S_grok_bslash_N (regcomp.c)
+XXX Remove this section if inapplicable.
 
-A crafted regular expression could cause heap-buffer-overflow read during
-compilation, potentially leading to sensitive information being leaked.
+The following modules will be removed from the core distribution in a
+future release, and will at that time need to be installed from CPAN.
+Distributions on CPAN which require these modules will need to list them as
+prerequisites.
 
-L<[perl #133192]|https://rt.perl.org/Ticket/Display.html?id=133192>
+The core versions of these modules will now issue C<"deprecated">-category
+warnings to alert you to this fact.  To silence these deprecation warnings,
+install the modules in question from CPAN.
 
-=head2 [CVE-2018-18314] Heap-buffer-overflow write in S_regatom (regcomp.c)
+Note that these are (with rare exceptions) fine modules that you are encouraged
+to continue to use.  Their disinclusion from core primarily hinges on their
+necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
+not usually on concerns over their design.
 
-A crafted regular expression could cause heap-buffer-overflow write during
-compilation, potentially allowing arbitrary code execution.
+=over
 
-L<[perl #131649]|https://rt.perl.org/Ticket/Display.html?id=131649>
+=item XXX
 
-=head1 Incompatible Changes
+XXX Note that deprecated modules should be listed here even if they are listed
+as an updated module in the L</Modules and Pragmata> section.
+
+=back
 
-There are no changes intentionally incompatible with 5.26.2.  If any exist,
-they are bugs, and we request that you submit a report.  See
-L</Reporting Bugs> below.
+[ List each other deprecation as a =head2 entry ]
+
+=head1 Performance Enhancements
+
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
+
+[ List each enhancement as a =item entry ]
+
+=over 4
+
+=item *
+
+XXX
+
+=back
 
 =head1 Modules and Pragmata
 
+XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
+go here.  If Module::CoreList is updated, generate an initial draft of the
+following sections using F<Porting/corelist-perldelta.pl>.  A paragraph summary
+for important changes should then be added by hand.  In an ideal world,
+dual-life modules would have a F<Changes> file that could be cribbed.
+
+[ Within each section, list entries as a =item entry ]
+
+=head2 New Modules and Pragmata
+
+=over 4
+
+=item *
+
+XXX
+
+=back
+
 =head2 Updated Modules and Pragmata
 
 =over 4
 
 =item *
 
-L<Archive::Tar> has been upgraded from version 2.24 to 2.24_01.
+L<XXX> has been upgraded from version A.xx to B.yy.
+
+=back
+
+=head2 Removed Modules and Pragmata
+
+=over 4
 
 =item *
 
-L<Module::CoreList> has been upgraded from version 5.20180414_26 to 5.20181129_26.
+XXX
+
+=back
+
+=head1 Documentation
+
+XXX Changes to files in F<pod/> go here.  Consider grouping entries by
+file and be sure to link to the appropriate page, e.g. L<perlfunc>.
+
+=head2 New Documentation
+
+XXX Changes which create B<new> files in F<pod/> go here.
+
+=head3 L<XXX>
+
+XXX Description of the purpose of the new file here
+
+=head2 Changes to Existing Documentation
+
+XXX Changes which significantly change existing files in F<pod/> go here.
+However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
+section.
+
+=head3 L<XXX>
+
+=over 4
+
+=item *
+
+XXX Description of the change here
 
 =back
 
@@ -81,86 +168,217 @@ The following additions or changes have been made to diagnostic output,
 including warnings and fatal error messages.  For the complete list of
 diagnostic messages, see L<perldiag>.
 
+XXX New or changed warnings emitted by the core's C<C> code go here.  Also
+include any changes in L<perldiag> that reconcile it to the C<C> code.
+
 =head2 New Diagnostics
 
+XXX Newly added diagnostic messages go under here, separated into New Errors
+and New Warnings
+
 =head3 New Errors
 
 =over 4
 
 =item *
 
-L<Unexpected ']' with no following ')' in (?[... in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Unexpected ']' with no following ')' in (?[... in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>">
+XXX L<message|perldiag/"message">
+
+=back
+
+=head3 New Warnings
 
-(F) While parsing an extended character class a ']' character was encountered
-at a point in the definition where the only legal use of ']' is to close the
-character class definition as part of a '])', you may have forgotten the close
-paren, or otherwise confused the parser.
+=over 4
 
 =item *
 
-L<Expecting close paren for nested extended charclass in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Expecting close paren for nested extended charclass in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>">
+XXX L<message|perldiag/"message">
 
-(F) While parsing a nested extended character class like:
+=back
 
-    (?[ ... (?flags:(?[ ... ])) ... ])
-                             ^
+=head2 Changes to Existing Diagnostics
 
-we expected to see a close paren ')' (marked by ^) but did not.
+XXX Changes (i.e. rewording) of diagnostic messages go here
+
+=over 4
 
 =item *
 
-L<Expecting close paren for wrapper for nested extended charclass in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Expecting close paren for wrapper for nested extended charclass in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>">
+XXX Describe change here
+
+=back
+
+=head1 Utility Changes
 
-(F) While parsing a nested extended character class like:
+XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
+Most of these are built within the directory F<utils>.
 
-    (?[ ... (?flags:(?[ ... ])) ... ])
-                              ^
+[ List utility changes as a =head2 entry for each utility and =item
+entries for each change
+Use L<XXX> with program names to get proper documentation linking. ]
 
-we expected to see a close paren ')' (marked by ^) but did not.
+=head2 L<XXX>
+
+=over 4
+
+=item *
+
+XXX
 
 =back
 
-=head2 Changes to Existing Diagnostics
+=head1 Configuration and Compilation
+
+XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
+go here.  Any other changes to the Perl build process should be listed here.
+However, any platform-specific changes should be listed in the
+L</Platform Support> section, instead.
+
+[ List changes as a =item entry ].
 
 =over 4
 
 =item *
 
-L<Syntax error in (?[...]) in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|perldiag/"Syntax error in (?[...]) in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>">
+XXX
 
-This fatal error message has been slightly expanded (from "Syntax error in
-(?[...]) in regex mE<sol>%sE<sol>") for greater clarity.
+=back
+
+=head1 Testing
+
+XXX Any significant changes to the testing of a freshly built perl should be
+listed here.  Changes which create B<new> files in F<t/> go here as do any
+large changes to the testing harness (e.g. when parallel testing was added).
+Changes to existing files in F<t/> aren't worth summarizing, although the bugs
+that they represent may be covered elsewhere.
+
+[ List each test improvement as a =item entry ]
+
+=over 4
+
+=item *
+
+XXX
 
 =back
 
-=head1 Acknowledgements
+=head1 Platform Support
+
+XXX Any changes to platform support should be listed in the sections below.
+
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
+
+=head2 New Platforms
+
+XXX List any platforms that this version of perl compiles on, that previous
+versions did not.  These will either be enabled by new files in the F<hints/>
+directories, or new subdirectories and F<README> files at the top level of the
+source tree.
+
+=over 4
+
+=item XXX-some-platform
+
+XXX
+
+=back
+
+=head2 Discontinued Platforms
+
+XXX List any platforms that this version of perl no longer compiles on.
+
+=over 4
+
+=item XXX-some-platform
+
+XXX
+
+=back
+
+=head2 Platform-Specific Notes
+
+XXX List any changes for specific platforms.  This could include configuration
+and compilation changes or changes in portability/compatibility.  However,
+changes within modules for platforms should generally be listed in the
+L</Modules and Pragmata> section.
+
+=over 4
+
+=item XXX-some-platform
+
+XXX
+
+=back
+
+=head1 Internal Changes
 
-Perl 5.26.3 represents approximately 8 months of development since Perl 5.26.2
-and contains approximately 4,500 lines of changes across 51 files from 15
-authors.
+XXX Changes which affect the interface available to C<XS> code go here.  Other
+significant internal changes for future core maintainers should be noted as
+well.
 
-Excluding auto-generated files, documentation and release tools, there were
-approximately 770 lines of changes to 10 .pm, .t, .c and .h files.
+[ List each change as a =item entry ]
 
-Perl continues to flourish into its third decade thanks to a vibrant community
-of users and developers.  The following people are known to have contributed
-the improvements that became Perl 5.26.3:
+=over 4
+
+=item *
+
+XXX
+
+=back
+
+=head1 Selected Bug Fixes
+
+XXX Important bug fixes in the core language are summarized here.  Bug fixes in
+files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
+
+[ List each fix as a =item entry ]
+
+=over 4
+
+=item *
+
+XXX
+
+=back
+
+=head1 Known Problems
+
+XXX Descriptions of platform agnostic bugs we know we can't fix go here.  Any
+tests that had to be C<TODO>ed for the release would be noted here.  Unfixed
+platform specific bugs also go here.
 
-Aaron Crane, Abigail, Chris 'BinGOs' Williams, Dagfinn Ilmari Mannsåker, David
-Mitchell, H.Merijn Brand, James E Keenan, John SJ Anderson, Karen Etheridge,
-Karl Williamson, Sawyer X, Steve Hay, Todd Rinaldo, Tony Cook, Yves Orton.
+[ List each fix as a =item entry ]
 
-The list above is almost certainly incomplete as it is automatically generated
-from version control history.  In particular, it does not include the names of
-the (very much appreciated) contributors who reported issues to the Perl bug
-tracker.
+=over 4
+
+=item *
+
+XXX
+
+=back
+
+=head1 Errata From Previous Releases
+
+=over 4
+
+=item *
+
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
+
+=back
+
+=head1 Obituary
+
+XXX If any significant core contributor has died, we've added a short obituary
+here.
+
+=head1 Acknowledgements
 
-Many of the changes included in this version originated in the CPAN modules
-included in Perl's core.  We're grateful to the entire CPAN community for
-helping Perl to flourish.
+XXX Generate this with:
 
-For a more complete list of all of Perl's historical contributors, please see
-the F<AUTHORS> file in the Perl source distribution.
+  perl Porting/acknowledgements.pl v5.26.3..HEAD
 
 =head1 Reporting Bugs
 
diff --git a/vms/descrip_mms.template b/vms/descrip_mms.template
index 3ea179ae91..ad0aef4322 100644
--- a/vms/descrip_mms.template
+++ b/vms/descrip_mms.template
@@ -307,7 +307,7 @@ utils : $(utils1) $(utils2) $(utils3) $(utils4) $(utils5)
 extra.pods : miniperl
 	@ @extra_pods.com
 
-PERLDELTA_CURRENT = [.pod]perl5263delta.pod
+PERLDELTA_CURRENT = [.pod]perl5264delta.pod
 
 $(PERLDELTA_CURRENT) : [.pod]perldelta.pod
 	Copy/NoConfirm/Log $(MMS$SOURCE) $(PERLDELTA_CURRENT)
diff --git a/win32/GNUmakefile b/win32/GNUmakefile
index d72ccfb297..8e61597add 100644
--- a/win32/GNUmakefile
+++ b/win32/GNUmakefile
@@ -1691,7 +1691,7 @@ utils: $(HAVEMINIPERL) ..\utils\Makefile
 	copy ..\README.tw       ..\pod\perltw.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5263delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5264delta.pod
 	$(MINIPERL) -I..\lib $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
 	$(MINIPERL) -I..\lib ..\pod\perlmodlib.PL -q ..
@@ -1788,7 +1788,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5263delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5264delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
 	    perlapi.pod perlbs2000.pod perlce.pod perlcn.pod perlcygwin.pod \
 	    perldos.pod perlfreebsd.pod perlhaiku.pod perlhpux.pod \
 	    perlhurd.pod perlintern.pod perlirix.pod perljp.pod perlko.pod \
diff --git a/win32/Makefile b/win32/Makefile
index 7d656297de..8456ab8fd9 100644
--- a/win32/Makefile
+++ b/win32/Makefile
@@ -1291,7 +1291,7 @@ utils: $(PERLEXE) ..\utils\Makefile
 	copy ..\README.tw       ..\pod\perltw.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5263delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5264delta.pod
 	cd ..\win32
 	$(PERLEXE) $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
@@ -1390,7 +1390,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5263delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5264delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
 	    perlapi.pod perlbs2000.pod perlce.pod perlcn.pod perlcygwin.pod \
 	    perldos.pod perlfreebsd.pod perlhaiku.pod perlhpux.pod \
 	    perlhurd.pod perlintern.pod perlirix.pod perljp.pod perlko.pod \
diff --git a/win32/makefile.mk b/win32/makefile.mk
index 35ab8221fa..9986993ed7 100644
--- a/win32/makefile.mk
+++ b/win32/makefile.mk
@@ -1605,7 +1605,7 @@ utils: $(HAVEMINIPERL) ..\utils\Makefile
 	copy ..\README.tw       ..\pod\perltw.pod
 	copy ..\README.vos      ..\pod\perlvos.pod
 	copy ..\README.win32    ..\pod\perlwin32.pod
-	copy ..\pod\perldelta.pod ..\pod\perl5263delta.pod
+	copy ..\pod\perldelta.pod ..\pod\perl5264delta.pod
 	$(MINIPERL) -I..\lib $(PL2BAT) $(UTILS)
 	$(MINIPERL) -I..\lib ..\autodoc.pl ..
 	$(MINIPERL) -I..\lib ..\pod\perlmodlib.PL -q ..
@@ -1703,7 +1703,7 @@ distclean: realclean
 	-if exist $(LIBDIR)\Win32API rmdir /s /q $(LIBDIR)\Win32API
 	-if exist $(LIBDIR)\XS rmdir /s /q $(LIBDIR)\XS
 	-cd $(PODDIR) && del /f *.html *.bat roffitall \
-	    perl5263delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
+	    perl5264delta.pod perlaix.pod perlamiga.pod perlandroid.pod \
 	    perlapi.pod perlbs2000.pod perlce.pod perlcn.pod perlcygwin.pod \
 	    perldos.pod perlfreebsd.pod perlhaiku.pod perlhpux.pod \
 	    perlhurd.pod perlintern.pod perlirix.pod perljp.pod perlko.pod \
diff --git a/win32/pod.mak b/win32/pod.mak
index c35473054f..c3f0736869 100644
--- a/win32/pod.mak
+++ b/win32/pod.mak
@@ -54,6 +54,7 @@ POD = perl.pod	\
 	perl5261delta.pod	\
 	perl5262delta.pod	\
 	perl5263delta.pod	\
+	perl5264delta.pod	\
 	perl5280delta.pod	\
 	perl561delta.pod	\
 	perl56delta.pod	\
@@ -204,6 +205,7 @@ MAN = perl.man	\
 	perl5261delta.man	\
 	perl5262delta.man	\
 	perl5263delta.man	\
+	perl5264delta.man	\
 	perl5280delta.man	\
 	perl561delta.man	\
 	perl56delta.man	\
@@ -353,6 +355,7 @@ HTML = perl.html	\
 	perl5261delta.html	\
 	perl5262delta.html	\
 	perl5263delta.html	\
+	perl5264delta.html	\
 	perl5280delta.html	\
 	perl561delta.html	\
 	perl56delta.html	\
@@ -503,6 +506,7 @@ TEX = perl.tex	\
 	perl5261delta.tex	\
 	perl5262delta.tex	\
 	perl5263delta.tex	\
+	perl5264delta.tex	\
 	perl5280delta.tex	\
 	perl561delta.tex	\
 	perl56delta.tex	\