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Re: Pre-RFC: builtin:: functions for detecting numbers vs strings

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Martijn Lievaart
March 11, 2022 21:57
Re: Pre-RFC: builtin:: functions for detecting numbers vs strings
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Op 11-03-2022 om 22:25 schreef Dan Book:
> Depends on how it is used in Perl syntax. If you write that as the 
> literal value: `my $x = 01730;` then you have not assigned the 
> zipcode, but an octal number. If you write it as a string: `my $x = 
> '01730';` then it will be a string containing your intended zip code. 
> Thus you must represent zipcodes as strings. Regardless, this is not 
> very relevant to the proposed functions; if anything, they allow a 
> serializer to avoid misrepresenting such a value, as long as you 
> created it properly.

Not 'if anything', it's the whole point! Perl never had a problem, you 
create a string, treat it as a string, and it will be a string. However, 
a serialiser could make a mess, as it could not distinguish a number 
from a string, so it could conceivably interpret '01730' as a number. 
With the proposed changes the serialiser can see that it "is" a string, 
so it round trips back to a string, and not a number.


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