bug#10782: zero padding does not work in case of strings

[Praveen A]

$ printf %04d 12
0012$ printf %4d 12
  12$ printf %04s 12
  12$ printf %4s 12
  12$

It would be very useful if it works for strings too (I found this when
trying to zero pad hex values in an ipv6 address). Now it requires an
additional sed find and replace to get the desired result.

Thanks
Praveen
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