Comment tweak.
NVgf/NVff agree with -Duselongdouble.
Make sprintf %c and chr() on inf/nan return the U+FFFD.

%c was made to produce "Inf"/"NaN" earlier, but let's
keep with the Unicode way, and make chr() agree with %c.
pack c/C on inf/nan.

Made them return the 0xFF byte (and warn).  Not necessarily the best
choice, but there's not that much room in just 256 bytes for all of
the inf/-inf/nan.  This same choice will need to be made with wider
integer packs.
De-prefix Perl_isinfnan.
todo: expand the list of OS access builtins to update

...taken from an IRC conversation on #p5p
Upgrade to threads 1.96
sv_grow: performance improvement for short strings

Empty COW strings with CUR=0 ended up allocated as LEN=10.
Now they are rounded up to 4 or 8.

Timings:
+0   16.394324103 0.27%
+2   16.114379842 0.01%
+4   16.305622265 1.03%
+8   16.337438609 1.30%
+10  16.675009468 0.59%
with LD_LIBRARY_PATH=`pwd` perf stat -r2 ./perl t/harness t/op/*.t

+2 was consistently the best number, and +10 the worst.
regcomp.c: Silence Win32 compiler warning

This raised a signed/unsigned warning that is essentially spurious.
Under C99 isfinite/isinf/isnan are sizeof-aware macros.

So let's not test them with inlibc.
Don't use isfinitel/isinfl/isnanl if the C99 macros exist.

Moves the C99 logic from sv.c (?) to perl.h.
[perl #122556] Make undef $s free refs forthwith
Fix crash when lex subs are used for AUTOLOAD
Fix crash when lex subs are used for overload
Fix crash in leave_scope when my sub has CvGV

Sub declaration can reuse an existing stub.  So it is possible to define
a package sub using a stub that was originally lexical.  Hence,
leave_scope needs to take into account that a my-sub may not have a
name hek any more.
Fix crash with lex subs under -d
[Merge] Fix crashes with lexical subs

Various crashing resulting from code not taking CvGV(lexsub)==NULL
into account.
t/porting/readme.t: Get list from MANIFEST

Otherwise we end up failing because of editor or patch droppings
in Porting/.  The test was already skipping things ending with ~
but that was not sufficient.
perldiag grammar

1cd88304d70 fixed one grammatical error in this sentence.  This fixes
the other.
Alphabetise perldiag

Earlier in perldiag, it says:

    The messages are in alphabetical order, without regard to upper or
    lower-case.