I'm aware of PL_sv_undef and how it's used.e

Really? Then I'm surprised it took you this long to get with the program and discuss the actual idea, rather than blundering around in willful misinterpretation land.

In Perl land, undef is undef is undef.... and I believe that was a mistake

And you speak for all "Perl land" do you?

And I believe differently. So you'll excuse me if I pay little mind to your "I don't know why you're asking this question".

In Perl land, undef is undef is undef....

And I believe differently.

I've been looking for another example, and I can't find one. Do you know of another case where explicit undef or PL_sv_undef is distinguished from undefined?

If there is an example of undef not being undef other than the previously mentioned open hack, it's well hidden. If you believe differently, there's gotta be some obvious example I'm missing.

(Note that I only spoke about the current state of Perl land.)

f there is an example of undef not being undef other than the previously mentioned open hack, it's well hidden. If you believe differently, there's gotta be some obvious example I'm missing.

undef $foo;
utime $foo, $foo, "file";   # Sets atime, mtime to 00:00:00 Jan 1, 197
+0
utime undef, undef, "file"; # Sets atime, mtime to time().
[download]

And like I said The real question is about making explicit undef semantically different from indirect undef; and therefore making it more powerful, and useful.. It was not about what is, but what could be.

Like I said back here

But it's no big deal. (Really, it isn't).

But what follows that is the crux.

Is substr $x, $start, $end, undef more indicative of deleting the substring than substr $x, $start, $end, '';?

Three extra characters for sure, and I'm rarely in favour of longer over shorter, but in this case I think yes. The consensus appears to be no.

---

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

RIP an inspiration; A true Folk's Guy

it took you this long to get with the program and discuss the actual idea

"Long"? You mean my second post, where I said I didn't like the idea?

And you speak for all "Perl land" do you?

I spoke about all of the Perl code I've seen, which is quite substantial. It goes to show it's not a very Perlish concept.

Update: Added link.

The vanishing

By the way, the value returned by undef ...

Unattributed change (again).