React-day-picker: console warning: Received `false` for non-boolean attribute `tabIndex` (React 16)

[vulcanoidlogic]

Please see: https://codesandbox.io/s/ory016yr9 with developer tools open.

Using react 16.0.0-rc.2, react-day-picker 6.1.0

<DayPicker canChangeMonth={false} selectedDays={new Date()} />

Displays the following in developer console:

**Warning: Received `false` for non-boolean attribute `tabIndex`. If this is expected, cast the value to a string.
    in div (created by DayPicker)
    in div (created by DayPicker)**

I don't know how to create a Pull Request, but on my local, the warning disappears if I modify
DayPicker.js.

- tabIndex: this.props.canChangeMonth && this.props.tabIndex,
+ tabIndex: (this.props.canChangeMonth && this.props.tabIndex ? this.props.tabIndex : "-1"),

Thank you.

[gpbl]

Thanks @vulcanoidlogic for the report!

[gpbl]

Fixed in #501

[gpbl]

Published as 6.2.0.

[mhdSid]

I say the people who are responsible for REACT should fix this - cast whatever they need but not force us to cast ourselves.

[davidspiess]

@gpbl can this fix be backported to the 5.x.x branch?

[gpbl]

@davidspiess I think yes? I've never published a prev version! Try to send a PR, versions are tagged. Thanks