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PERLTODO(1)			 Perl Programmers Reference Guide		      PERLTODO(1)

       perltodo - Perl TO-DO List

       This is a list of wishes for Perl.  Send updates to perl5-porters@perl.org.  If you want
       to work on any of these projects, be sure to check the perl5-porters archives for past
       ideas, flames, and propaganda.  This will save you time and also prevent you from imple-
       menting something that Larry has already vetoed.  One set of archives may be found at:


To do during 5.6.x
       Support for I/O disciplines

       "perlio" provides this, but the interface could be a lot more straightforward.

       Autoload bytes.pm

       When the lexer sees, for instance, "bytes::length", it should automatically load the
       "bytes" pragma.

       Make "\u{XXXX}" et al work

       Danger, Will Robinson! Discussing the semantics of "\x{F00}", "\xF00" and "\U{F00}" on P5P
       will lead to a long and boring flamewar.

       Create a char *sv_pvprintify(sv, STRLEN *lenp, UV flags)

       For displaying PVs with control characters, embedded nulls, and Unicode.  This would be
       useful for printing warnings, or data and regex dumping, not_a_number(), and so on.

       Requirements: should handle both byte and UTF8 strings.	isPRINT() characters printed
       as-is, character less than 256 as \xHH, Unicode characters as \x{HHH}.  Don't assume
       ASCII-like, either, get somebody on EBCDIC to test the output.

       Possible options, controlled by the flags: - whitespace (other than ' ' of isPRINT())
       printed as-is - use isPRINT_LC() instead of isPRINT() - print control characters like
       this: "\cA" - print control characters like this: "^A" - non-PRINTables printed as '.'
       instead of \xHH - use \OOO instead of \xHH - use the C/Perl-metacharacters like \n, \t -
       have a maximum length for the produced string (read it from *lenp) - append a "..." to the
       produced string if the maximum length is exceeded - really fancy: print unicode characters
       as \N{...}

       NOTE: pv_display(), pv_uni_display(), sv_uni_display() are already doing something like
       the above.

       Overloadable regex assertions

       This may or may not be possible with the current regular expression engine. The idea is
       that, for instance, "\b" needs to be algorithmically computed if you're dealing with Thai
       text. Hence, the \b assertion wants to be overloaded by a function.


       o   Allow for long form of the General Category Properties, e.g "\p{IsOpenPunctuation}",
	   not just the abbreviated form, e.g.	"\p{IsPs}".

       o   Allow for the metaproperties: "XID Start", "XID Continue", "NF*_NO", "NF*_MAYBE"
	   (require the DerivedCoreProperties and DerviceNormalizationProperties files).

	   There are also multiple value properties still unimplemented: "Numeric Type", "East
	   Asian Width".

	       Case Mappings? http://www.unicode.org/unicode/reports/tr21/

	   Mostly implemented (all of 1:1, 1:N, N:1), only the "final sigma" and locale-specific
	   rules of SpecCase are not implemented.

       o   UTF-8 identifier names should probably be canonicalized: NFC?

       o   UTF-8 in package names and sub names?  The first is problematic because of the mapping
	   to pathnames, ditto for the second one if one does autosplitting, for example.  Some
	   of this works already in 5.8.0, but essentially it is unsupported.  Constructs to con-
	   sider, at the very least:

		   use utf8;
		   package UnicodePackage;
		   sub new { bless {}, shift };
		   sub UnicodeMethod1 { ... $_[0]->UnicodeMethod2(...) ... }
		   sub UnicodeMethod2 { ... } # in here caller(0) should contain Unicode
		   package main;
		   my $x = UnicodePackage->new;
		   print ref $x, "\n";	# should be Unicode
		   my $y = UnicodeMethod3 UnicodePackage ...;

	   In the above all UnicodeXxx contain (identifier-worthy) characters beyond the code
	   point 255, for example 256.	Wherever package/class or subroutine names can be
	   returned needs to be checked for Unicodeness.

       See "UNICODE REGULAR EXPRESSION SUPPORT LEVEL" in perlunicode for what's there and what's
       missing.  Almost all of Levels 2 and 3 is missing, and as of 5.8.0 not even all of Level 1
       is there.  They have some tricks Perl doesn't yet implement, such as character class sub-


       Work out exit/die semantics for threads

       There are some suggestions to use for example something like this: default to "(thread
       exiting first will) wait for the other threads until up to 60 seconds".	Other possibili-

	   use threads wait => 0;

       Do not wait.

	   use threads wait_for => 10;

       Wait up to 10 seconds.

	   use threads wait_for => -1;

       Wait for ever.


       Better support for nonpreemptive threading systems like GNU pth

       To better support nonpreemptive threading systems, perhaps some of the blocking functions
       internally in Perl should do a yield() before a blocking call.  (Now certain threads tests
       ({basic,list,thread.t}) simply do a yield() before they sleep() to give nonpreemptive
       thread implementations a chance).

       In some cases, like the GNU pth, which has replacement functions that are nonblocking
       (pth_select instead of select), maybe Perl should be using them instead when built for

       Typed lexicals for compiler

       Compiler workarounds for Win32

       AUTOLOADing in the compiler

       Fixing comppadlist when compiling

       Cleaning up exported namespace

       Complete signal handling

       Add "PERL_ASYNC_CHECK" to opcodes which loop; replace "sigsetjmp" with "sigjmp"; check
       "wait" for signal safety.

       Out-of-source builds

       This was done for 5.6.0, but needs reworking for 5.7.x

       POSIX realtime support

       POSIX 1003.1 1996 Edition support--realtime stuff: POSIX semaphores, message queues,
       shared memory, realtime clocks, timers, signals (the metaconfig units mostly already exist
       for these)

       UNIX98 support

       Reader-writer locks, realtime/asynchronous IO

       IPv6 Support

       There are non-core modules, such as "Socket6", but these will need integrating when IPv6
       actually starts to really happen.  See RFC 2292 and RFC 2553.

       Long double conversion

       Floating point formatting is still causing some weird test failures.


       Locales and Unicode interact with each other in unpleasant ways.  One possible solution
       would be to adopt/support ICU:


       Arithmetic on non-Arabic numerals

       "[1234567890]" aren't the only numerals any more.

       POSIX Unicode character classes

       ("[=a=]" for equivalence classes, "[.ch.]" for collation.)  These are dependent on Unicode
       normalization and collation.

       Factoring out common suffices/prefices in regexps (trie optimization)

       Currently, the user has to optimize "foo|far" and "foo|goo" into "f(?:oo|ar)" and "[fg]oo"
       by hand; this could be done automatically.

       Security audit shipped utilities

       All the code we ship with Perl needs to be sensible about temporary file handling, lock-
       ing, input validation, and so on.

       Sort out the uid-setting mess

       Currently there are several problems with the setting of uids ($<, $> for the real and
       effective uids).  Firstly, what exactly setuid() call gets invoked in which platform is
       simply a big mess that needs to be untangled.  Secondly, the effects are apparently not
       standard across platforms, (if you first set $< and then $>, or vice versa, being uid ==
       euid == zero, or just euid == zero, or as a normal user, what are the results?).  The test
       suite not (usually) being run as root means that these things do not get much testing.
       Thirdly, there's quite often a third uid called saved uid, and Perl has no knowledge of
       that feature in any way.  (If one has the saved uid of zero, one can get back any real and
       effective uids.)  As an example, to change also the saved uid, one needs to set the real
       and effective uids twice-- in most systems, that is: in HP-UX that doesn't seem to work.

       Custom opcodes

       Have a way to introduce user-defined opcodes without the subroutine call overhead of an
       XSUB; the user should be able to create PP code. Simon Cozens has some ideas on this.

       DLL Versioning

       Windows needs a way to know what version of an XS or "libperl" DLL it's loading.

       Introduce @( and @)

       $( may return "foo bar baz". Unfortunately, since groups can theoretically have spaces in
       their names, this could be one, two or three groups.

       Floating point handling

       "NaN" and "inf" support is particularly troublesome.  (fp_classify(), fp_class(),
       fp_class_d(), class(), isinf(), isfinite(), finite(), isnormal(), unordered(), <ieeefp.h>,
       <fp_class.h> (there are metaconfig units for all these) (I think), fp_setmask(), fp_get-
       mask(), fp_setround(), fp_getround() (no metaconfig units yet for these).  Don't forget
       finitel(), fp_classl(), fp_class_l(), (yes, both do, unfortunately, exist), and

       As of Perl 5.6.1, there is a Perl macro, Perl_isnan().

       IV/UV preservation

       Nicholas Clark has done a lot of work on this, but work is continuing.  "+", "-" and "*"
       work, but guards need to be in place for "%", "/", "&", "oct", "hex" and "pack".

       Replace pod2html with something using Pod::Parser

       The CPAN module "Marek::Pod::Html" may be a more suitable basis for a "pod2html" con-
       verter; the current one duplicates the functionality abstracted in "Pod::Parser", which
       makes updating the POD language difficult.

       Automate module testing on CPAN

       When a new Perl is being beta tested, porters have to manually grab their favourite CPAN
       modules and test them - this should be done automatically.

       sendmsg and recvmsg

       We have all the other BSD socket functions but these. There are metaconfig units for these
       functions which can be added. To avoid these being new opcodes, a solution similar to the
       way "sockatmark" was added would be preferable. (Autoload the "IO::whatever" module.)

       Rewrite perlre documentation

       The new-style patterns need full documentation, and the whole document needs to be a lot

       Convert example code to IO::Handle filehandles

       Document Win32 choices

       Check new modules

       Make roffitall find pods and libs itself

       Simon Cozens has done some work on this but it needs a rethink.

To do at some point
       These are ideas that have been regularly tossed around, that most people believe should be
       done maybe during 5.8.x

       Remove regular expression recursion

       Because the regular expression engine is recursive, badly designed expressions can lead to
       lots of recursion filling up the stack. Ilya claims that it is easy to convert the engine
       to being iterative, but this has still not yet been done. There may be a regular expres-
       sion engine hit squad meeting at TPC5.

       Memory leaks after failed eval

       Perl will leak memory if you "eval "hlagh hlagh hlagh hlagh"". This is partially because
       it attempts to build up an op tree for that code and doesn't properly free it. The same
       goes for non-syntactically-correct regular expressions. Hugo looked into this, but decided
       it needed a mark-and-sweep GC implementation.

       Alan notes that: The basic idea was to extend the parser token stack ("YYSTYPE") to
       include a type field so we knew what sort of thing each element of the stack was.  The
       perly.c code would then have to be postprocessed to record the type of each entry on the
       stack as it was created, and the parser patched so that it could unroll the stack properly
       on error.

       This is possible to do, but would be pretty messy to implement, as it would rely on even
       more sed hackery in perly.fixer.

       bitfields in pack

       Cross compilation

       Make Perl buildable with a cross-compiler. This will play havoc with Configure, which
       needs to know how the target system will respond to its tests; maybe "microperl" will be a
       good starting point here.  (Indeed, Bart Schuller reports that he compiled up "microperl"
       for the Agenda PDA and it works fine.)  A really big spanner in the works is the boot-
       strapping build process of Perl: if the filesystem the target systems sees is not the same
       what the build host sees, various input, output, and (Perl) library files need to be
       copied back and forth.

       As of 5.8.0 Configure mostly works for cross-compilation (used successfully for iPAQ
       Linux), miniperl gets built, but then building DynaLoader (and other extensions) fails
       since MakeMaker knows nothing of cross-compilation.  (See INSTALL/Cross-compilation for
       the state of things.)

       Perl preprocessor / macros

       Source filters help with this, but do not get us all the way. For instance, it should be
       possible to implement the "??" operator somehow; source filters don't (quite) cut it.

       Perl lexer in Perl

       Damian Conway is planning to work on this, but it hasn't happened yet.

       Using POSIX calls internally

       When faced with a BSD vs. SysV -style interface to some library or system function, perl's
       roots show in that it typically prefers the BSD interface (but falls back to the SysV
       one).  One example is getpgrp().  Other examples include "memcpy" vs. "bcopy".  There are
       others, mostly in pp_sys.c.

       Mostly, this item is a suggestion for which way to start a journey into an "#ifdef" for-
       est.  It is not primarily a suggestion to eliminate any of the "#ifdef" forests.

       POSIX calls are perhaps more likely to be portable to unexpected architectures. They are
       also perhaps more likely to be actively maintained by a current vendor.	They are also
       perhaps more likely to be available in thread-safe versions, if appropriate.

       -i rename file when changed

       It's only necessary to rename a file when inplace editing when the file has changed.
       Detecting a change is perhaps the difficult bit.

       All ARGV input should act like <>

       eg "read(ARGV, ...)" doesn't currently read across multiple files.

       Support for rerunning debugger

       There should be a way of restarting the debugger on demand.

       Test Suite for the Debugger

       The debugger is a complex piece of software and fixing something here may inadvertently
       break something else over there.  To tame this chaotic behaviour, a test suite is neces-

       my sub foo { }

       The basic principle is sound, but there are problems with the semantics of self-referen-
       tial and mutually referential lexical subs: how to declare the subs?

       One-pass global destruction

       Sweeping away all the allocated memory in one go is a laudable goal, but it's difficult
       and in most cases, it's easier to let the memory get freed by exiting.

       Rewrite regexp parser

       There has been talk recently of rewriting the regular expression parser to produce an
       optree instead of a chain of opcodes; it's unclear whether or not this would be a win.

       Cache recently used regexps

       This is to speed up

	   for my $re (@regexps) {
	       $matched++ if /$re/

       "qr//" already gives us a way of saving compiled regexps, but it should be done automati-

       Cross-compilation support

       Bart Schuller reports that using "microperl" and a cross-compiler, he got Perl working on
       the Agenda PDA. However, one cannot build a full Perl because Configure needs to get the
       results for the target platform, for the host.

       Bit-shifting bitvectors


	   vec($v, 1000, 1) = 1;

       One should be able to do

	   $v <<= 1;

       and have the 999'th bit set.

       Currently if you try with shift bitvectors you shift the NV/UV, instead of the bits in the
       PV.  Not very logical.

       debugger pragma

       The debugger is implemented in Perl in perl5db.pl; turning it into a pragma should be
       easy, but making it work lexically might be more difficult. Fiddling with $^P would be

       use less pragma

       Identify areas where speed/memory tradeoffs can be made and have a hint to switch between

       switch structures

       Although we have "Switch.pm" in core, Larry points to the dormant "nswitch" and "cswitch"
       ops in pp.c; using these opcodes would be much faster.

       Cache eval tree


       Shrink opcode tables

       Optimize away @_

       Look at the "reification" code in "av.c"

       Prototypes versus indirect objects

       Currently, indirect object syntax bypasses prototype checks.

       Install HTML

       HTML versions of the documentation need to be installed by default; a call to "install-
       html" from "installperl" may be all that's necessary.

       Prototype method calls

       Return context prototype declarations


       Garbage collection

       There have been persistent mumblings about putting a mark-and-sweep garbage detector into
       Perl; Alan Burlison has some ideas about this.

       IO tutorial

       Mark-Jason Dominus has the beginnings of one of these.

       Rewrite perldoc

       There are a few suggestions for what to do with "perldoc": maybe a full-text search, an
       index function, locating pages on a particular high-level subject, and so on.

       Install .3p manpages

       This is a bone of contention; we can create ".3p" manpages for each built-in function, but
       should we install them by default? Tcl does this, and it clutters up "apropos".

       Unicode tutorial

       Simon Cozens promises to do this before he gets old.

       Update POSIX.pm for 1003.1-2

       Retargetable installation

       Allow @INC to be changed after Perl is built.

       POSIX emulation on non-POSIX systems

       Make "POSIX.pm" behave as POSIXly as possible everywhere, meaning we have to implement
       POSIX equivalents for some functions if necessary.

       Rename Win32 headers

       Finish off lvalue functions

       They don't work in the debugger, and they don't work for list or hash slices.

       Update sprintf documentation

       Hugo van der Sanden plans to look at this.

       Use fchown/fchmod internally

       This has been done in places, but needs a thorough code review.	Also fchdir is available
       in some platforms.

       Make v-strings overloaded objects

       Instead of having to guess whether a string is a v-string and thus needs to be displayed
       with %vd, make v-strings (readonly) objects (class "vstring"?) with a stringify overload.

       Allow restricted hash assignment

       Currently you're not allowed to assign to a restricted hash at all, even with the same

	   %restricted = (foo => 42);  # error

       This should be allowed if the new keyset is a subset of the old keyset.	May require more
       extra code than we'd like in pp_aassign.

       Should overload be inheritable?

       Should overload be 'contagious' through @ISA so that derived classes would inherit their
       base classes' overload definitions?  What to do in case of overload conflicts?

       Taint rethink

       Should taint be stopped from affecting control flow, if ($tainted)?  Should tainted sym-
       bolic method calls and subref calls be stopped?	(Look at Ruby's $SAFE levels for inspira-

Vague ideas
       Ideas which have been discussed, and which may or may not happen.

       ref() in list context

       It's unclear what this should do or how to do it without breaking old code.

       Make tr/// return histogram of characters in list context

       There is a patch for this, but it may require Unicodification.

       Compile to real threaded code

       Structured types

       Modifiable $1 et al.

	   ($x = "elephant") =~ /e(ph)/;
	   $1 = "g"; # $x = "elegant"

       What happens if there are multiple (nested?) brackets? What if the string changes between
       the match and the assignment?

       Procedural interfaces for IO::*, etc.

       Some core modules have been accused of being overly-OO. Adding procedural interfaces could
       demystify them.

       RPC modules

       Attach/detach debugger from running program

       With "gdb", you can attach the debugger to a running program if you pass the process ID.
       It would be good to do this with the Perl debugger on a running Perl program, although I'm
       not sure how it would be done.


       A non-core module that would use "native" GUI to create graphical applications.

       foreach(reverse ...)


	   foreach (reverse @_) { ... }

       puts @_ on the stack, reverses it putting the reversed version on the stack, then iterates
       forwards. Instead, it could be special-cased to put @_ on the stack then iterate back-

       Constant function cache

       Approximate regular expression matching

       These items always need doing:

       Update guts documentation

       Simon Cozens tries to do this when possible, and contributions to the "perlapi" documenta-
       tion is welcome.

       Add more tests

       Michael Schwern will donate $500 to Yet Another Society when all core modules have tests.

       Update auxiliary tools

       The code we ship with Perl should look like good Perl 5.

       Create debugging macros

       Debugging macros (like printsv, dump) can make debugging perl inside a C debugger much
       easier.	A good set for gdb comes with mod_perl.  Something similar should be distributed
       with perl.

       The proper way to do this is to use and extend Devel::DebugInit.  Devel::DebugInit also
       needs to be extended to support threads.

       See p5p archives for late May/early June 2001 for a recent discussion on this topic.

       truncate to the people

       One can emulate ftruncate() using F_FREESP and F_CHSIZ fcntls (see the UNIX FAQ for
       details).  This needs to go somewhere near pp_sys.c:pp_truncate().

       One can emulate truncate() easily if one has ftruncate().  This emulation should also go
       near pp_sys.pp_truncate().

       Unicode in Filenames

       chdir, chmod, chown, chroot, exec, glob, link, lstat, mkdir, open, opendir, qx, readdir,
       readlink, rename, rmdir, stat, symlink, sysopen, system, truncate, unlink, utime.  All
       these could potentially accept Unicode filenames either as input or output (and in the
       case of system and qx Unicode in general, as input or output to/from the shell).  Whether
       a filesystem - an operating system pair understands Unicode in filenames varies.

       Known combinations that have some level of understanding include Microsoft NTFS, Apple
       HFS+ (In Mac OS 9 and X) and Apple UFS (in Mac OS X), NFS v4 is rumored to be Unicode, and
       of course Plan 9.  How to create Unicode filenames, what forms of Unicode are accepted and
       used (UCS-2, UTF-16, UTF-8), what (if any) is the normalization form used, and so on,
       varies.	Finding the right level of interfacing to Perl requires some thought.  Remember
       that an OS does not implicate a filesystem.

       Note that in Windows the -C command line flag already does quite a bit of the above (but
       even there the support is not complete: for example the exec/spawn are not Unicode-aware)
       by turning on the so-called "wide API support".

Recently done things
       These are things which have been on the todo lists in previous releases but have recently
       been completed.

       Alternative RE syntax module

       The "Regexp::English" module, available from the CPAN, provides this:

	   my $re = Regexp::English
	   -> start_of_line
	   -> literal('Flippers')
	   -> literal(':')
	   -> optional
	       -> whitespace_char
	   -> end
	   -> remember
	       -> multiple
		   -> digit;


       Safe signal handling

       A new signal model went into 5.7.1 without much fanfare. Operations and "malloc"s are no
       longer interrupted by signals, which are handled between opcodes. This means that
       "PERL_ASYNC_CHECK" now actually does something. However, there are still a few things that
       need to be done.

       Tie Modules

       Modules which implement arrays in terms of strings, substrings or files can be found on
       the CPAN.


       "Time::HiRes" has been integrated into the core.

       setitimer and getimiter

       Adding "Time::HiRes" got us this too.

       Testing __DIE__ hook

       Tests have been added.

       CPP equivalent in Perl

       A C Yardley will probably have done this by the time you can read this.	This allows for a
       generalization of the C constant detection used in building "Errno.pm".

       Explicit switch statements

       "Switch.pm" has been integrated into the core to give you all manner of "switch...case"


       This is "Fatal.pm".


       Nick Ing-Simmons has made UTF-EBCDIC (UTR13) work with Perl.

	   EBCDIC?	  http://www.unicode.org/unicode/reports/tr16/

       UTF Regexes

       Although there are probably some small bugs to be rooted out, Jarkko Hietaniemi has made
       regular expressions polymorphic between bytes and characters.

       perlcc to produce executable

       "perlcc" was recently rewritten, and can now produce standalone executables.

       END blocks saved in compiled output

       Secure temporary file module

       Tim Jenness' "File::Temp" is now in core.

       Integrate Time::HiRes

       This module is now part of core.

       Turn Cwd into XS

       Benjamin Sugars has done this.

       Mmap for input

       Nick Ing-Simmons' "perlio" supports an "mmap" IO method.

       Byte to/from UTF8 and UTF8 to/from local conversion

       "Encode" provides this.

       Add sockatmark support

       Added in 5.7.1

       Mailing list archives

       http://lists.perl.org/ , http://archive.develooper.com/

       Bug tracking

       Since 5.8.0 perl uses the RT bug tracking system from Jesse Vincent, implemented by Robert
       Spier at http://bugs.perl.org/

       Integrate MacPerl

       Chris Nandor and Matthias Neeracher have integrated the MacPerl changes into 5.6.0.

       Web "nerve center" for Perl

       http://use.perl.org/ is what you're looking for.

       Regular expression tutorial

       "perlretut", provided by Mark Kvale.

       Debugging Tutorial

       "perldebtut", written by Richard Foley.

       Integrate new modules

       Jarkko has been integrating madly into 5.7.x

       Integrate profiler

       "Devel::DProf" is now a core module.

       Y2K error detection

       There's a configure option to detect unsafe concatenation with "19", and a CPAN module.

       Regular expression debugger

       While not part of core, Mark-Jason Dominus has written "Rx" and has also come up with a
       generalised strategy for regular expression debugging.

       POD checker

       That's, uh, podchecker

       "Dynamic" lexicals

       Cache precompiled modules

Deprecated Wishes
       These are items which used to be in the todo file, but have been deprecated for some rea-

       Loop control on do{}

       This would break old code; use "do{{ }}" instead.

       Lexically scoped typeglobs

       Not needed now we have lexical IO handles.

       format BOTTOM

       report HANDLE

       Damian Conway's text formatting modules seem to be the Way To Go.

       Generalised want()/caller())

       Robin Houston's "Want" module does this.

       Named prototypes

       This seems to be delayed until Perl 6.

       Built-in globbing

       The "File::Glob" module has been used to replace the "glob" function.

       Regression tests for suidperl

       "suidperl" is deprecated in favour of common sense.

       Cached hash values

       We have shared hash keys, which perform the same job.

       Add compression modules

       The compression modules are a little heavy; meanwhile, Nick Clark is working on experimen-
       tal pragmata to do transparent decompression on input.

       Reorganise documentation into tutorials/references

       Could not get consensus on P5P about this.

       Remove distinction between functions and operators

       Caution: highly flammable.

       Make XS easier to use

       Use "Inline" instead, or SWIG.

       Make embedding easier to use

       Use "Inline::CPR".

       man for perl

       See the Perl Power Tools. ( http://language.perl.com/ppt/ )

       my $Package::variable

       Use "our" instead.

       "or" tests defined, not truth

       Suggesting this on P5P will cause a boring and interminable flamewar.

       "class"-based lexicals

       Use flyweight objects, secure hashes or, dare I say it, pseudo-hashes instead.  (Or what-
       ever will replace pseudohashes in 5.10.)


       "ByteLoader" covers this.

       Lazy evaluation / tail recursion removal

       "List::Util" gives first() (a short-circuiting grep); tail recursion removal is done manu-
       ally, with "goto &whoami;". (However, MJD has found that "goto &whoami" introduces a per-
       formance penalty, so maybe there should be a way to do this after all: "sub foo {START:
       ... goto START;" is better.)

       Make "use utf8" the default

       Because of backward compatibility this is difficult: scripts could not contain any legacy
       eight-bit data (like Latin-1) anymore, even in string literals or pod.  Also would intro-
       duce a measurable slowdown of at least few percentages since all regular expression opera-
       tions would be done in full UTF-8.  But if you want to try this, add -DUSE_UTF8_SCRIPTS to
       your compilation flags.

       Unicode collation and normalization

       The Unicode::Collate and Unicode::Normalize modules by SADAHIRO Tomoyuki have been
       included since 5.8.0.

	   Collation?	  http://www.unicode.org/unicode/reports/tr10/
	   Normalization? http://www.unicode.org/unicode/reports/tr15/

       pack/unpack tutorial

       Wolfgang Laun finished what Simon Cozens started.

perl v5.8.0				    2003-02-18				      PERLTODO(1)
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