Returns a copy of this duration with the specified duration added.
!(p)
This instance is immutable and unaffected by this method call.
@param duration the duration to add, positive or negative, not null
@return a {@code Duration} based on this duration with the specified duration added, not null
@throws ArithmeticException if numeric overflow occurs
Returns a copy of this duration with the specified duration added. !(p) This instance is immutable and unaffected by this method call.
@param duration the duration to add, positive or negative, not null @return a {@code Duration} based on this duration with the specified duration added, not null @throws ArithmeticException if numeric overflow occurs