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Re: Pre-RFC: Real "boolean" SV type

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Tomasz Konojacki
August 4, 2021 15:44
Re: Pre-RFC: Real "boolean" SV type
Message ID:
On Wed, 4 Aug 2021 15:58:19 +0100
"Paul \"LeoNerd\" Evans" <> wrote:

> I propose the addition of a new SV type, of SVt_BOOL. Should I write an
> RFC?
> This type will act much like the existing "booleans" of PL_sv_no and
> PL_sv_yes, except its type will remain distinct, so it will be possible
> to distinguish "that SV is a boolean". This is a requirement for
> certain kinds of data serialisation - such as JSON or MsgPack - and may
> be useful for many other purposes too.
> Still to be determined: a pureperl interface on it. E.g. would this be
> possible:
>   use feature 'bool';
>   my $yes = true;   # new literal value keywords
>   my $no  = false;  #
>   use Scalar::Util 'svtype';
>   is( svtype($yes), "BOOL", 'true is SVt_BOOL');
> Thoughts on a postcard*.
> *: Where "postcard" means: **PLEASE KEEP REPLIES SHORT**. This is a
> pre-RFC question. Replies should be limited to the question of whether
> I should write the RFC - not about the feature itself.

What are 'true' and 'false' exactly? Are they synonyms for !!1 and !!0
or are they brand new values that stringify to "true" and "false"?

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