Pickadale issue with hidden field

I have issue with hidden field
with default setting when i submit form it sends

```
Scale[datum]: 09.06.2018
Scale[datum]_submit: 09.07.2018
Scale[uhrzeit]: 14:46
Scale[user]: 176
```

But at server side i was getting **Scale[datum]** value overwritten with **Scale[datum]_submit** value

The only workaround i have found for the problem was $(".pickDateInput").pickadate({hiddenPrefix:'burn_in_hell'});

it works good
```
Scale[datum]: 09.06.2018
burn_in_hellScale[datum]_submit: 09.07.2018
Scale[uhrzeit]: 14:46
Scale[user]: 176
```
p.s. burn_in_hell - it was addressed to HTTP protocol developers