message: Changed FlatList keytype frok number to string
  Fix for issuecomment
diff: @@ -187,7 +187,7 @@ class PickerNB extends Component {
  <Content>
  <FlatList
  data={this.state.dataSource}
  - keyExtractor={(item, index) => index}
  + keyExtractor={(item, index) => String(index)}
  renderItem={({ item }) => <ListItem
  selected={item.props.value === this.props.selectedValue}
  button
  