Commits on Aug 25, 2022

1. Fix intcomma() failing with a string as input when ndigits is not None …

   Calling `humanize.intcomma("1", 0)` would fail with the error message
   ```
   ValueError: Unknown format code 'f' for object of type 'str'
   ```
   
   Fix this by first converting the string to a `float` or `int`. Always converting the string to a `float` would not work for cases like `humanize.intcomma("1")`, as this would output `'1.0'` instead of the desired output `'1'`.
   This also requires using a while loop instead of recursion, as calling this function again would now remove the thousands separator, leading to an infinite recursion. This also makes it easier to reason about IMO.
   Also add some new test cases covering this and a new example.

   

   Luflosi committed Aug 25, 2022
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