toLocaleString returns incorrect value/NaN for some locales.

The toLocaleString method returns NaN for some locales.

Please find the demo app attached.

The demo app has code to decrement values from 0 on button click.

in the onClick signal handler, see the use of toLocaleString. 

When the locale is set to "en_AU" it works fine and the value goes from 0 to -1, -2, -3 ...

When the locale is set to "hr_HR" it doesn't work as expected the value is set to NaN after 0, -1.