Fix#1324, which went stale many years ago, and is now re-opened. It can be considered a follow-on to PR #4479 which was installed in May. The user complains of a *very* small loss of precision. This can be corrected by using `StringHelper::convertToString` in lieu of a simple cast from float to string in two places. `Style\NumberFormat\Formatter` is quite straightforward. `Writer\Csv` is a bit more complicated. If you put a float with more than 15 digits precision in a Csv, on opening it Excel will give a pop-up, saying something inaccurate like "We've corrected this for you - is that okay?" Better to avoid that by making sure to avoid too much precision when writing to Csv.
oleibman