Commits on Jul 5, 2016

1. feat: reinterpret precision field for strings …

   This commit changes the behavior of formatting string arguments
   with both width and precision fields set.
   
   Documentation says that the `width` field is the "minimum width"
   that the format should take up. If the value's string does not
   fill up this many characters, then the padding specified by
   fill/alignment will be used to take up the required space.
   
   This is true for all formatted types except string, which is truncated
   down to `precision` number of chars and then all of `fill`, `align` and
   `width` fields are completely ignored.
   
   For example: `format!("{:/^10.8}", "1234567890);` emits "12345678".
   In the contrast Python version works as the expected:
   ```python
   >>> '{:/^10.8}'.format('1234567890')
   '/12345678/'
   ```
   
   This commit gives back the `Python` behavior by changing the `precision`
   field meaning to the truncation and nothing more. The result string *will*
   be prepended/appended up to the `width` field with the proper `fill` char.
   
   However, this is the breaking change.
   
   Also updated `std::fmt` docs about string precision.
   
   Signed-off-by: Evgeny Safronov <division494@gmail.com>

   

   3Hren committed Jul 5, 2016
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