* @param unit The unit of quantity.
* @param sign Whether or not to add a sign also for positive numbers.
*
* @param unit The unit of quantity.
* @param sign Whether or not to add a sign also for positive numbers.
*
* @param unit The unit of quantity.
* @param sign Whether or not to add a sign also for positive numbers.
*
* @param unit The unit of quantity.
* @param sign Whether or not to add a sign also for positive numbers.
*
* @param precision The number of digits after the decimal separator.
* @param sign Whether or not to add a sign also for positive numbers.
*
* @param precision The number of digits after the decimal separator.
* @param sign Whether or not to add a sign also for positive numbers.
*