Regexen
make RE engine thread-safe
POSIX [=bar=] and [.zap.] would nice too but there's no API for them
- (=bar= could be done with Unicode, though)
+ (=bar= could be done with Unicode, though, see TR about normalization forms)
approximate matching
+Security
+ use fchown, fchmod (and futimes?) internally when possible
+ use fchdir(how portable?)
+
Reliable Signals
custom opcodes
alternate runops() for signal despatch
Miscellaneous
add new modules (Archive::Tar, Compress::Zlib, CPAN::FTP?)
+ sub-second sleep? (integrate Time::HiRes?)
+ floating point handling: nans, infinities, fp exception masks, etc
replace pod2html with new PodtoHtml? (requires other modules from CPAN)
automate testing with large parts of CPAN
+ Unicode collation?
Ongoing
keep filenames 8.3 friendly, where feasible