Scrolling when I have duplicate value in items

[wenit123]

Describe the bug
I have duplicate value in the items array. When I select the one I want, it show the selected one in the screen. But in drop down will scroll automatically to the last one of the same value.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'screen'
2. Click on 'drop down'
3. Scroll down to ' Wyoming 0%'
4. See error, the value show on the screen is right, but in dropdown it jump to 'Montana 0%'

Expected behavior

Screenshots

Additional details

• Device: Iphone 11
• OS: IOS14
• react-native-picker-select version: ^8.0.0
• react-native version: ^0.63.2
• expo sdk version: [e.g. 38 or n/a]

Reproduction and/or code sample

                  placeholder={{
                    label: 'Select tax rate...',
                    value: 0,
                  }}
                  onValueChange={(itemValue, itemIndex) => this.setState({ selectedTax: itemValue })}
                  items={this.state.taxRates.map(obj =>
                    ({
                      label: obj.name + ' ' + obj.rate + '%',
                      value: obj.rate,
                    })
                  )}
                  style={{
                    inputIOS: { color: 'gray' },
                    inputAndroid: { color: 'gray' },
                  }}
                />```

[lfkwtz]

look for itemKey in the docs