Hans van der Meer wrote:
> 
> This text suggest that the the test is on whether "string" as a whole is
> a number (taken as having digits 0123456789 only, I presume) of contains
> nondigits and thus isn't a number.


> However, it seems the macro tests on the first character only.

The wiki page has that remark added as a corrigendum to the article.

Best wishes,
Taco
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