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Postings from December 2021
On Sunday, 19 December 2021, 13:28:23 CET, Oodler 577 <oodler577@sdf-eu.org> wrote:
> Thank you, this is super helpful. My final comment is just to
> reiterate what I most recently said; as long as this doesn't
> affect how things currently work with undef/q{}/0 and existing
> built-ins/ops; and we get a C<unknown> built-in that does for
> unknown values what C<defined> does for undef'd values,
For interpolation, I would suggest it behave like undef, but with a warning. I would (only half-joking here), also consider it to stringify to U+FFFD REPLACEMENT CHARACTER.
my $name = unknown;
say "Hello, $name!";
Output:
Use of unknown value $name in say at ...
Hello, �!
> As an exercise, I wonder how many use cases for undef would remain
> if unknown was available. If the answer is "not many", then maybe
> the answer would be a compatible tweak to undef and not the
> creation of a new special value. Just a thought...
I would not recommend changing current behavior of undef. That would be widespread carnage.
Best,
Ovid
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