Outside day classes not applied

[catamphetamine]

I tried passing classNames property.
In short, it adds rrui__outline CSS class name to days.

Code:

// Default `react-day-picker` CSS class names.
// Should have been exported from `react-day-picker`.
// https://github.com/gpbl/react-day-picker/blob/master/src/classNames.js
// Can change in future versions of `react-day-picker`.
const REACT_DAY_PICKER_DEFAULT_CLASS_NAMES = {
	container: 'DayPicker',
	wrapper: 'DayPicker-wrapper',
	interactionDisabled: 'DayPicker--interactionDisabled',
	months: 'DayPicker-Months',
	month: 'DayPicker-Month',

	navBar: 'DayPicker-NavBar',
	navButtonPrev: 'DayPicker-NavButton DayPicker-NavButton--prev',
	navButtonNext: 'DayPicker-NavButton DayPicker-NavButton--next',
	navButtonInteractionDisabled: 'DayPicker-NavButton--interactionDisabled',

	caption: 'DayPicker-Caption',
	weekdays: 'DayPicker-Weekdays',
	weekdaysRow: 'DayPicker-WeekdaysRow',
	weekday: 'DayPicker-Weekday',
	body: 'DayPicker-Body',
	week: 'DayPicker-Week',
	weekNumber: 'DayPicker-WeekNumber',
	day: 'DayPicker-Day',
	footer: 'DayPicker-Footer',
	todayButton: 'DayPicker-TodayButton',

	// default modifiers
	today: 'today',
	selected: 'selected',
	disabled: 'disabled',
	outside: 'outside',
}

const REACT_DAY_PICKER_CLASS_NAMES = {
	...REACT_DAY_PICKER_DEFAULT_CLASS_NAMES,
	/* `.DayPicker-wrapper` is a `<div/>` wrapping the calendar.
	   It gets focused upon expanding which causes an outline.
	   That outline can be safely removed because it doesn't aid accesiblity. */
	wrapper: REACT_DAY_PICKER_DEFAULT_CLASS_NAMES.wrapper + ' rrui__outline',
	/* Calendar days have `background-color` on `:focus`.
	   Therefore their `outline` can be safely removed. */
	day: REACT_DAY_PICKER_DEFAULT_CLASS_NAMES.day + ' rrui__outline',
	/* Previous/Next month buttons have `background-color` on `:focus`.
	   Therefore their `outline` can be safely removed. */
	navButtonPrev: REACT_DAY_PICKER_DEFAULT_CLASS_NAMES.navButtonPrev + ' rrui__outline',
	navButtonNext: REACT_DAY_PICKER_DEFAULT_CLASS_NAMES.navButtonNext + ' rrui__outline'
}

The result is that outside days have DayPicker-Day rrui__outline outside CSS class.
You can see that outside modifier CSS class name is incorrectly generated.

It's the latest version react-day-picker@7.2.4.

[littlehome-eugene]

have similar finding,

when outside days are selected, selected class is not applied