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Postings from March 2022
Yuki Kimoto wrote:
>
> My understanding:
>
> Perl 5.36+ can detect a string and a number completely.
>
> a string - SvPOK
> a number - (SvIOK or SvNOK) and not SvPOK
No, I think Perl has always been able to do this. Deep down, it is currently implemented like this:
is a string - SVp_POK
is a number - SVp_IOK or SVp_NOK
Note that scalars can be, and indeed often are, strings and numbers at the same time. The new feature in 5.36 is that Perl can now also detect if a value /started/ as a string or number, which is important to know in some rare use cases:
created as string - SVf_POK
created as number - (SVf_IOK or SVf_NOK) and not SVf_POK
Any proposed name needs to reflect this distinction.
Thus, variations of these would probably work:
- created_as_number
- initialized_as_number
While variations of these will not work:
- is_number
- treat_as_number
(I share Ovid's doubts about "canonically".)
--
Arne Johannessen
<https://arne.johannessen.de/>
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