docs: public static Double toNullableDouble(Object value) {
  		if (value == null)
  			return null;
  
  		if (value instanceof Date)
  			return (double) ((Date) value).getTime();
  		if (value instanceof Calendar)
  			return (double) ((Calendar) value).getTimeInMillis();
  		if (value instanceof Duration)
  			return (double) ((Duration) value).toMillis();
  
  		if (value instanceof Boolean)
  			return (boolean) value ? 1.0 : 0.0;
  
  		if (value instanceof Integer)
  			return (double) ((int) value);
  		if (value instanceof Short)
  			return (double) ((short) value);
  		if (value instanceof Long)
  			return (double) ((long) value);
  		if (value instanceof Float)
  			return (double) ((float) value);
  		if (value instanceof Double)
  			return (double) value;
  
  		if (value instanceof String)
  			try {
  				return Double.parseDouble((String) value);
  			} catch (NumberFormatException ex) {
  				return null;
  			}
  
  		return null;
  	}