[swift-evolution] String update

[Michael Ilseman]

Significant leading zeros is a good point. Another would be non-default-radix.

> On Jan 16, 2018, at 12:22 PM, C. Keith Ray via swift-evolution <swift-evolution at swift.org> wrote:
> 
> people may want digits as characters in order to see zeros. parsing phone numbers and social security numbers need zeros.
> 
> C. Keith Ray
> https://leanpub.com/wepntk <https://leanpub.com/wepntk> <- buy my book?
> http://agilesolutionspace.blogspot.com/ <http://agilesolutionspace.blogspot.com/>
> twitter: @ckeithray
> http://www.thirdfoundationsw.com/keith_ray_resume_2014_long.pdf <http://www.thirdfoundationsw.com/keith_ray_resume_2014_long.pdf>
> 
> On Jan 16, 2018, at 11:24 AM, Eneko Alonso via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
> 
>> Digits could always be inferred to be numeric (Int) and they should always be “exact” (to match "\d"):
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