This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Karl Williamson [Mon, 22 May 2017 21:11:41 +0000 (15:11 -0600)]
perldelta: Clarified perlhack entry
Karl Williamson [Mon, 22 May 2017 21:10:03 +0000 (15:10 -0600)]
perldelta: Reordered split() so most important is 1st
Karl Williamson [Mon, 22 May 2017 21:07:56 +0000 (15:07 -0600)]
perldelta: Clarify seek() entry
Karl Williamson [Mon, 22 May 2017 21:06:17 +0000 (15:06 -0600)]
perldelta: Move dtrace ticket number
I believe this makes it clearer that it applies to all the fixes in the
list
Karl Williamson [Mon, 22 May 2017 21:02:30 +0000 (15:02 -0600)]
perldelta: Remove duplicate entry
This is an exact copy of another entry for [perl #129090]
Karl Williamson [Mon, 22 May 2017 20:58:03 +0000 (14:58 -0600)]
pod/perldelta: Reword #129903 description
I looked at the ticket to understand better how to clarify this.
Karl Williamson [Mon, 22 May 2017 20:56:54 +0000 (14:56 -0600)]
pod/perldelta: Reword #130010 description
I looked at the commits and ticket to clarify this
Karl Williamson [Mon, 22 May 2017 20:51:56 +0000 (14:51 -0600)]
perldelta: Add missing =item
Karl Williamson [Mon, 22 May 2017 20:45:48 +0000 (14:45 -0600)]
perldelta: Nit fixes
This has what I believe are non-controversial changes, missing or extra
words, typos and punctuation, plus a couple of clarifications and
cautions.
Karl Williamson [Mon, 22 May 2017 20:16:22 +0000 (14:16 -0600)]
perldelta: Standardize on ticket #'s being at ends
Bug fixes are hereby standardized so the ticket number appears at the
end of the entry, instead of some being at the beginning.
Karl Williamson [Mon, 22 May 2017 19:11:32 +0000 (13:11 -0600)]
podcheck: Module::Signatures is known correct.
Karl Williamson [Mon, 22 May 2017 19:39:49 +0000 (13:39 -0600)]
perldelta: Add pod formatting codes
This adds mostly C<>, but some F<>, B<>, I<> as well. Fixed an S<> to
C<>
Karl Williamson [Mon, 22 May 2017 20:07:53 +0000 (14:07 -0600)]
perldelta: Fix overlooked C<.>
This is turned into C<".">. It should have been done as part of
df48f9a40b9a0dd18a1e55dffe80ba98b5e5a99c
Karl Williamson [Mon, 22 May 2017 19:23:40 +0000 (13:23 -0600)]
perldelta: Fix link displays
This fixes the displays of some links. Most of this fix is
that one shouldn't say
C<L<foo/bar>>
This is because it translates to 'bar in foo' entirely in the
fixed-width font. And 'in foo' shouldn't be in fixed width. (I will
bring this up to see if Pod::Simple should change, or it should be
flagged by Pod::Checker.)
Instead one should currently write
L<C<bar>|foo/bar>
Karl Williamson [Mon, 22 May 2017 17:49:28 +0000 (11:49 -0600)]
perldelta: Standardize references to Perl
There is a mixture of saying Perl "5.foo" and "v5.foo". This
standardizes to the two most common variants. When the word "Perl"
precedes the version number, the "v" is omitted. Perl is capitalized.
When the number stands alone, the "v" is added.
However, the NAME section must say 'perl v5.26.0' as that form is
expected from Porting/pod_lib.pl
Sawyer X [Mon, 22 May 2017 19:21:39 +0000 (21:21 +0200)]
Fix various POD issues
James E Keenan [Mon, 22 May 2017 19:19:03 +0000 (15:19 -0400)]
Correct POD formating error detected by t/porting/podcheck.t.
The text in the link lacked the open- and close-double quotes found in the
section head being linked to.
Karl Williamson [Mon, 22 May 2017 17:32:14 +0000 (11:32 -0600)]
perldelta: Note new test scripts
I went through the commits since 5.24.1, and found these added scripts
that were missing from perldelta. This entailed rewriting the existing
entry on APItest, as a bunch of test files were split.
Karl Williamson [Mon, 22 May 2017 16:46:54 +0000 (10:46 -0600)]
perldelta: Fix some single char C< >
Some characters that should have been in C< > weren't.
Single character C< > should instead be C<" "> (where the space is any
character). This is how they are displayed anyway in non-gui devices,
and in gui, the single character really doesn't stand out as distinct,
whereas longer strings tend to. Though, I did add quotes around the
range operator "..", as that wasnt very distinct without them.
I removed the C<> from C<1>, as the 1 is a generic value.
Karl Williamson [Mon, 22 May 2017 15:29:43 +0000 (09:29 -0600)]
perldelta: Collapse "Removed Deprecations"
I just added this section in
1f81bc188d3574dfda690659ebeed2bdc92a42d6,
but on further contemplation, I think it makes more sense to just have
the "Deprecations" section deal with anything regarding deprecations.
It is short, and undeprecating something is rare, and I have revised the
entry so it makes sense being in the plain "Deprecations" section.
David Mitchell [Mon, 22 May 2017 15:22:23 +0000 (16:22 +0100)]
perldelta: tweak SV flags; eliminate hv_fetchs
Expand the section on SV flags: they have been eliminated rather than just
changed.
And remove this entry:
Change C<hv_fetch(…, "…", …, …)> to C<hv_fetchs(…, "…", …)>
The dual-life dists all use Devel::PPPort, so they can use this
function even though it was only added in 5.10.
which appears to be just an implementation detail.
David Mitchell [Mon, 22 May 2017 15:09:50 +0000 (16:09 +0100)]
perldelta: expand Unicode/utf8 API changes
Move all the Unicode/utf8 API changes into a separate bulleted
sub-section, and add mentions of every macro/function added to the API.
Previously there was just a vague "Several macros and functions have been
added to the public API" without enumerating them.
David Mitchell [Mon, 22 May 2017 14:01:18 +0000 (15:01 +0100)]
perldelta: sort the "Internal Changes" section.
Group entries that have similar themes such as unicode API or optree
No changes apart from cut-n-paste of whole =item entries.
David Mitchell [Mon, 22 May 2017 13:50:21 +0000 (14:50 +0100)]
perldelta: move an entry from Internal to Bug Fixes
David Mitchell [Mon, 22 May 2017 13:44:05 +0000 (14:44 +0100)]
perldelta: remove some "Internal Changes" entries
In general we don't list internals changes unless it affects the API or is
very visible (e.g. performance enhancement). So I've deleted the following
entries:
Several new internal C macros have been added that take a string
literal as arguments, alongside existing routines that take the
equivalent value as two ...
AFAKT, this is referring to:
strEQs() and strNEs()
_memEQs() and _memNEs
which aren't listed as part of the API, so we don't (yet?) want to
advertise them.
The code in F<gv.c> that determines whether a variable has a special
meaning to Perl has been simplified.
which is great, but isn't visible AFAIKT.
Use C<my_strlcat()> in C<locale.c>. While C<strcat()> is safe in this
context, some compilers were optimizing this to C<strcpy()> causing a
porting test to fail that looks for unsafe code. Rather than fighting
this, we just use C<my_strlcat()> instead.
Perhaps this should be reported as bug fix instead?
David Mitchell [Mon, 22 May 2017 13:17:22 +0000 (14:17 +0100)]
perldelta: re-order "Core Enhancements" entries
... based subjectively on importance. I've put new language features
first, followed by unicodey-stuff.
There have been no edits - purely cut-n-pasting an entire entry as-is to a
new location.
David Mitchell [Mon, 22 May 2017 13:07:29 +0000 (14:07 +0100)]
perldelta: fix some issues raised by Karl
moved utf8_hop_safe() to Internals;
removed
A regression from the previous development release, 5.23.3, where
compiling a regular expression could crash the interpreter has been
fixed. [perl #128686].
since that was a typo - it was 5.25.3, and since the bug appeared, and was
fixed in, the same development branch, doesn't need mentioning.
David Mitchell [Mon, 22 May 2017 11:56:00 +0000 (12:56 +0100)]
perldelta: Fix some issues raised by Ævar
See http://nntp.perl.org/group/perl.perl5.porters/244357
David Mitchell [Mon, 22 May 2017 10:18:03 +0000 (11:18 +0100)]
perldelta: update @INC blurb in Notice
The original text got mangled when applied; I've readded the missing
sentence, and reworded things slightly to be a more informative initial
mention of what the issue is (like mentioning that the change is for
security reasons).
This should hopefully cover anything that was missed in the text removed
by
2c4393cceb72ac358b.
David Mitchell [Mon, 22 May 2017 08:37:31 +0000 (09:37 +0100)]
Time-HiRes: fix a do/@INC issue in Makefile.PL
The code assumed that File::Spec->catfile(".", ...) would create a
"./" prefix in the pathname that is fed to do(), but it turns out
catfile() doesn't work like that.
This didn't affect perl builds since Makefile.PL is normally run by
miniperl, which *does* have '.' in @INC. But it you tried to build
Time-HiRes manually, it would fail.
[ This commit is half of a diff proposed by James E Keenan - I decided the
File::Spec part could wait till after 5.26.0 ]
Karl Williamson [Sun, 21 May 2017 03:41:42 +0000 (21:41 -0600)]
perldelta: Add a C<> formatting code.
Karl Williamson [Sun, 21 May 2017 03:38:10 +0000 (21:38 -0600)]
perldelta: Cleanup documentation changes section
I looked at all the files in /pod for their changes since 5.24. I think
this action should be added to the RMG. I removed the changes that are
described elswhere in perldelta, adding boiler plate to that effect.
I removed the changes I thought would not be useful for someone reading
this, but added significant numbers of substantive changes that had been
omitted.
Karl Williamson [Sun, 21 May 2017 03:36:16 +0000 (21:36 -0600)]
perldelta: Add a section for undeprecations
and populate it.
Karl Williamson [Sun, 21 May 2017 03:31:57 +0000 (21:31 -0600)]
perldelta: Note that utf8_hop_safe is for XS code
I actually don't think this should be here. I think it should be in
Internal Changes. Note that there were a bunch more functions added
for XS code, and these are there. Perhaps there should be some separate
sections there, with one for enhancements.
Ævar Arnfjörð Bjarmason [Sat, 20 May 2017 13:53:04 +0000 (13:53 +0000)]
perldelta: remove the @INC blurb I added
Remove the @INC blurb I added in commit
90ed3b64f9 ("perldelta:
clarify what '.' and @INC is about", 2017-05-16).
I wrote this independently before seeing the RT bug that had a much
more complete overview, which I applied in commit
89853d76c8 ("Add
more extensive information about @INC changes into
perldelta (RT#131304)", 2017-05-17).
As a result we now have this section, and then right below it another
section authored by Dominic Hargreaves.
This needs to be resolved before release. As noted in
89853d76c8 some
things could arguably be salvaged from my section as it's more brief,
but I can't think of a good way to rewrite this, so just remove it.
Craig A. Berry [Sat, 20 May 2017 02:52:51 +0000 (21:52 -0500)]
More perldelta tweaks.
Streamline or omit some of the VMS changes. No need to mention
minor test refactorings or other tiny bits of work product that
don't represent notable user-visible changes from 5.24. And fix
one comma splice in the OS X section.
Karl Williamson [Fri, 19 May 2017 20:08:51 +0000 (14:08 -0600)]
perldelta: Note that part of perlre was rewritten
Karl Williamson [Fri, 19 May 2017 20:07:36 +0000 (14:07 -0600)]
perldelta: Fix wording about literal "{"
This clarifies the wording and corrects the various messages raised
about it.
Karl Williamson [Fri, 19 May 2017 20:04:56 +0000 (14:04 -0600)]
perldelta: Nits
This adds missing words, links, space, and format controls
Karl Williamson [Fri, 19 May 2017 19:58:53 +0000 (13:58 -0600)]
perldelta: Make version numbers more consistent
This removes unnecessary .0 from version numbers, and removes the intial
'v' for those following the word 'Perl'
Aaron Crane [Fri, 19 May 2017 14:07:38 +0000 (15:07 +0100)]
perldelta: tweaks to obituaries
Karl Williamson [Fri, 19 May 2017 03:25:28 +0000 (21:25 -0600)]
perldelta: Use two spaces after sentences.
Karl Williamson [Fri, 19 May 2017 03:17:43 +0000 (21:17 -0600)]
perldelta: Various nits.
Treat e.g. and i.e. Uniformly;
add some missing words;
spelling, commas, dashes.
Ævar Arnfjörð Bjarmason [Thu, 18 May 2017 08:02:35 +0000 (08:02 +0000)]
perldelta: don't dollar-quote an env variable like $ENV, should be ENV
The way it was before made it appear that perhaps we meant a Perl
variable.
Karl Williamson [Thu, 18 May 2017 05:10:08 +0000 (23:10 -0600)]
perldelta: This file is for 5.26, not 5.24
Karl Williamson [Thu, 18 May 2017 05:09:01 +0000 (23:09 -0600)]
perldelta: Rmv entry that applies just to a devel release
This is not applicable to someone upgrading from any prior stable
release.
Karl Williamson [Thu, 18 May 2017 05:07:10 +0000 (23:07 -0600)]
perldelta: Don't mention development release numbers
We have agreed in previous years that this is distracting detail to
someone reading the stable release notes.
There is still one left, but I ran out of time tonight to figure out
what to say.
Karl Williamson [Thu, 18 May 2017 05:05:32 +0000 (23:05 -0600)]
perldelta: Add unescaped "{" to Notice
On irc, we agreed that this is important enough to be highighted there.
Karl Williamson [Thu, 18 May 2017 05:02:33 +0000 (23:02 -0600)]
perldelta: Move some alleged 'enhancements' to 'incompatible changes'
I reordered the latter section so the most important things in my view
were earlier in it.
I also extensively reworded the unescaped { section to hopefully better
explain it.
I think the enhancements section should be reordered by importance. For
example I don't think /xx is the most important enhancement in 5.26.
But I'll let others decide.
Karl Williamson [Thu, 18 May 2017 05:00:47 +0000 (23:00 -0600)]
perldelta: Improve wording about Unicode scx property
Karl Williamson [Thu, 18 May 2017 04:51:46 +0000 (22:51 -0600)]
perldelta: Move section adjacent to similar one
These two sections about @INC and dot need to be combined into one,
and should be in Security.
I'll let someone else take a stab at that.
Karl Williamson [Thu, 18 May 2017 04:47:40 +0000 (22:47 -0600)]
perldelta: Remove duplicate entry
Sawyer X [Wed, 17 May 2017 19:15:54 +0000 (21:15 +0200)]
Fix another perldelta link
Sawyer X [Wed, 17 May 2017 19:15:45 +0000 (21:15 +0200)]
Fix perldelta link
Sawyer X [Wed, 17 May 2017 19:09:18 +0000 (21:09 +0200)]
Remove documentation of 5.25.4 fix in 5.26.0 delta
Sawyer X [Wed, 17 May 2017 19:09:07 +0000 (21:09 +0200)]
Fix git conflict indicator
Sawyer X [Sun, 14 May 2017 09:39:43 +0000 (11:39 +0200)]
Extra commas
Dominic Hargreaves [Wed, 17 May 2017 14:17:42 +0000 (15:17 +0100)]
Add more extensive information about @INC changes into perldelta (RT#131304)
This mainly takes existing text written by Dave Mitchell, Kent Fredric,
Sawyer X and James E Keenan.
[Ævar: I applied this from RT #131304. It had conflicts which I
resolved to the best of my ability.
The submitted patch removed the "'.' and @INC" section which I rewrote
in
90ed3b64f9 ("perldelta: clarify what '.' and @INC is about",
2017-05-16). I resolved the conflict to keep it.
Maybe this was the wrong move. We're now mentioning the removal of "."
in 3 prominent places, at the top in "Notice", "Core Enhancements",
and "Security".
Maybe the best move here is to remove the section I wrote, although as
noted in my commit I think one redeeming factor it if is the plain
language describing the change (i.e. not assuming knowledge of
variables like @INC right off the bat), but obviously I'm biased
there].
Karl Williamson [Wed, 17 May 2017 15:53:34 +0000 (09:53 -0600)]
perldelta: Fix broken link
Ævar Arnfjörð Bjarmason [Tue, 16 May 2017 18:30:10 +0000 (18:30 +0000)]
perldelta: clarify what '.' and @INC is about
The existing section we had here was totally misleading. I couldn't
understand "now provides a way to build" and "if you want it turn X
on" differently than meaning that '.' was still in @INC by default and
you had to compile perl with some optional switch to turn it on.
It turns out[1] that the exact opposite of that is the case. This is
on by default. Rewrite the entire section to make that clear to the
reader.
While I'm at it dumb it down a bit to be understandable to someone
who's just upgrading Perl. Not everyone knows what @INC is offhand,
but describing how we now load libraries is understandable to
everyone.
Then cover PERL_USE_UNSAFE_INC=1 and how it's set by various toolchain
modules now, and finally avoid talking about both
DEFAULT_INC_EXCLUDES_DOT and -Ddefault_inc_excludes_dot in the context
of a build option, just consistently mention only
-Ddefault_inc_excludes_dot.
We could go into much more detail here. See the "[RFC] We need prose
for perl526delta about "." in @INC removal" thread[2]. I think
including something like that probably makes sense later in the
document, but this should suffice for an intro section, and I'll let
others who proposed more detailed updates send their own patches for
further clarifying this feature.
1. "Re: Perl 5.26.0-RC1 is now
available!" (<CAATnKFABh0PjQK0WLqC-MTugj==O22zjwRgDapfb1EHvLr0tKw@mail.gmail.com>"
2. <CAATnKFCSeGh6Lcwux1CsGP=6pQSQtG7_bViZRGji3Soa5b=1ow@mail.gmail.com>
(http://www.nntp.perl.org/group/perl.perl5.porters/2017/03/msg243763.html)
Ævar Arnfjörð Bjarmason [Sat, 13 May 2017 22:14:50 +0000 (22:14 +0000)]
perldelta: clarify how undeffing HV/AV is faster now
There were better notes in the change that introduced this[1]. Copy
the performance numbers from there, and say "arrays and
hashes". instead of "AV and HV". Better to use the more familiar names
than the internal struct names which are mostly only familiar to core
devs.
1.
be98855787 ("speed up AV and HV clearing/undeffing", 2016-10-26)
Yves Orton [Sat, 13 May 2017 22:00:15 +0000 (22:00 +0000)]
perldelta: clarify what these new capture variables are for
[Ævar: I originally had a worse patch for this, but Yves had a better
one to fixup into mine. See "Re: Perl 5.26.0-RC1 is now available!"[1]
on list for context.].
1. <CANgJU+Uh0Kg_fS=3Ux5WvZtskOcOQT2Gjvy8tgYHjCTd0-d90Q@mail.gmail.com>
Ævar Arnfjörð Bjarmason [Sat, 13 May 2017 21:56:19 +0000 (21:56 +0000)]
perldelta: move the note about utf8_hop() to the bottom
A note about a relatively obscure internal API function really doesn't
belong so high up in the "Core Enhancements", before core visible user
changes.
Move this to the bottom, all of the other things in this section are
things normal Perl programmers might actually use/encounter/care
about, whereas this change is only relevant for some XS maintainers.
Ævar Arnfjörð Bjarmason [Sat, 13 May 2017 21:46:43 +0000 (21:46 +0000)]
perldelta: remove "maybe this won't be in 5.26" note about PERL_USE_UNSAFE_INC
This was originally added in commit
8bbdbfcb89 ("Perldelta updates in
prep for tomorrows release", 2016-11-19), we're now at RC1 so it's
pretty clear that this will be in the release.
Ævar Arnfjörð Bjarmason [Sat, 13 May 2017 22:06:44 +0000 (22:06 +0000)]
perldelta: mention when lexical_subs were introduced
Doesn't take up much space, and makes you aware that if you e.g. are
using 5.18 already you can now use this in all your code without fear.
Ævar Arnfjörð Bjarmason [Sat, 13 May 2017 22:01:51 +0000 (22:01 +0000)]
perldelta: 'for slightly more detail' -> 'for more details'
There's no need to inject "slightly" there, that documentation section
looks pretty complete to me.
Ævar Arnfjörð Bjarmason [Sat, 13 May 2017 21:41:54 +0000 (21:41 +0000)]
perldelta: grammar fix: "[process] do not function well" -> "does not ..."
H.Merijn Brand [Wed, 17 May 2017 13:44:46 +0000 (15:44 +0200)]
fixed couple of compilation failures with g++ (JHI)
H.Merijn Brand [Sat, 13 May 2017 16:11:53 +0000 (18:11 +0200)]
Restore _test make target
Sawyer X [Thu, 11 May 2017 22:26:54 +0000 (00:26 +0200)]
Fix META.json
Sawyer X [Thu, 11 May 2017 21:51:38 +0000 (23:51 +0200)]
Add epigraph
Sawyer X [Thu, 11 May 2017 17:22:49 +0000 (19:22 +0200)]
Merge branch 'release/5.26.0-RC1' into blead
Sawyer X [Thu, 11 May 2017 17:07:23 +0000 (19:07 +0200)]
disarm RCnnn bump
Sawyer X [Thu, 11 May 2017 15:20:16 +0000 (17:20 +0200)]
Regenerate last-second acknowledgements
David H. Gutteridge [Thu, 11 May 2017 15:01:52 +0000 (09:01 -0600)]
Add missing commas to perlfunc
Karl Williamson [Wed, 10 May 2017 04:28:15 +0000 (22:28 -0600)]
perldeprecation: Add imminent XS deprecations
The deprecated XS functions that have been scheduled to be removed did
not make it into this pod.
David H. Gutteridge [Thu, 11 May 2017 15:01:52 +0000 (09:01 -0600)]
Add missing commas to perlfunc
Karl Williamson [Wed, 10 May 2017 04:28:15 +0000 (22:28 -0600)]
perldeprecation: Add imminent XS deprecations
The deprecated XS functions that have been scheduled to be removed did
not make it into this pod.
Sawyer X [Thu, 11 May 2017 13:03:58 +0000 (15:03 +0200)]
Update META files
Sawyer X [Thu, 11 May 2017 13:03:12 +0000 (15:03 +0200)]
bump version to RCnnn
Sawyer X [Thu, 11 May 2017 13:00:42 +0000 (15:00 +0200)]
add new release to perlhist
Sawyer X [Thu, 11 May 2017 12:52:31 +0000 (14:52 +0200)]
Fix link
Sawyer X [Thu, 11 May 2017 12:36:27 +0000 (14:36 +0200)]
Pod fixes
Sawyer X [Thu, 11 May 2017 12:33:54 +0000 (14:33 +0200)]
Finalize perldelta with acknowledgements and updated modules
David Mitchell [Mon, 8 May 2017 20:06:38 +0000 (21:06 +0100)]
avoid a memory wrap in sv_vcatpvfn_flags()
RT #131260
When calculating the new size of PL_efloatbuf, avoid wrapping 'need'.
Sawyer X [Thu, 11 May 2017 11:28:59 +0000 (13:28 +0200)]
reorder
Sawyer X [Thu, 11 May 2017 11:28:51 +0000 (13:28 +0200)]
Correct links
Sawyer X [Thu, 11 May 2017 11:01:16 +0000 (13:01 +0200)]
Sorted with cool trickery help by arc
Sawyer X [Thu, 11 May 2017 10:59:11 +0000 (12:59 +0200)]
Manually replace 52513 with 5260 perldelta filename
Sawyer X [Thu, 11 May 2017 10:40:10 +0000 (12:40 +0200)]
For now it's just perldelta.pod
Sawyer X [Thu, 11 May 2017 10:35:57 +0000 (12:35 +0200)]
Cleanups
Sawyer X [Wed, 10 May 2017 22:06:13 +0000 (00:06 +0200)]
Reorder section
Sawyer X [Wed, 10 May 2017 21:55:27 +0000 (23:55 +0200)]
Merge perl52512delta.pod
Sawyer X [Wed, 10 May 2017 21:54:26 +0000 (23:54 +0200)]
Merge perl52511delta.pod
Sawyer X [Wed, 10 May 2017 14:01:08 +0000 (16:01 +0200)]
Merge perl52510delta.pod
Sawyer X [Wed, 10 May 2017 13:58:40 +0000 (15:58 +0200)]
Merge perl5259delta.pod
Sawyer X [Wed, 10 May 2017 13:48:23 +0000 (15:48 +0200)]
Merge perl5258delta.pod
Sawyer X [Wed, 10 May 2017 12:59:33 +0000 (14:59 +0200)]
Merge perl5257delta.pod
Sawyer X [Wed, 10 May 2017 12:20:38 +0000 (14:20 +0200)]
Merge perl5256delta.pod
Sawyer X [Wed, 10 May 2017 12:16:17 +0000 (14:16 +0200)]
Merge perl5255delta.pod