Return values of custom handlers not returned

[aekt]

Hi, thank you for the library!

I see that most custom handlers are treated in this way:

react-day-picker/src/DayPickerInput.js

Lines 428 to 438 in 421af9f

	handleInputKeyDown(e) {
	if (e.keyCode === TAB) {
	this.hideDayPicker();
	} else {
	this.showDayPicker();
	}
	if (this.props.inputProps.onKeyDown) {
	e.persist();
	this.props.inputProps.onKeyDown(e);
	}
	}

But this ignores the return value of the custom handler, would it be better if we do something like:

if (this.props.inputProps.onKeyDown) { 
     e.persist(); 
     return this.props.inputProps.onKeyDown(e); 
}
return true;

But I'm not sure if it'll cause unexpected problems by side-effect. Or is the current way intentional? What do you think?