code: @Deprecated
       boolean isNumberNegative(double number) {
           if (Double.isNaN(number)) {
               return false;
           }
           return isNegative(multiply(number));
       }
docs: This is a special function used by the CompactDecimalFormat subclass
  to determine if the number to be formatted is negative.
  
  @param number The number to format.
  @return True if number is negative.
  @deprecated This API is ICU internal only.
  @hide draft / provisional / internal are hidden on Android