BarChartDataSet comparison fails with same BarChartDataSet taken from BarChartView

- [x] I've read, understood, and done my best to follow the [*CONTRIBUTING guidelines](https://github.com/jjatie/Charts/blob/master/CONTRIBUTING.md).

## What did you do?

Tried to compare a BarChartDataset from existing BarChartView with a new BarChartDataSet

## What did you expect to happen?

Same Dataset to return true

## What happened instead?

Always returns false, even when they are same

## Charts Environment

**Charts version/Branch/Commit Number:** 3.6.0 according to downloaded pod
**Xcode version:** 12.5.1
**Swift version:** 5.4.2
**Platform(s) running Charts:** iOS
**macOS version running Xcode:** 11.5.2

Purpose here is to see if new data has come from API and check if existing graph needs updation

Here barData is

` let barData = self.barChartView.barData`

chartDataSet is

` let chartDataSet = BarChartDataSet(entries: dataEntries, label: "WATER")`

dataEntries is

`var dataEntries = [BarChartDataEntry]() // values are added to this and then checked`

**Logs from Console**

```
(lldb) po barData.dataSets[0] as! BarChartDataSet == chartDataSet
false

(lldb) po barData.dataSets[0]
Charts.BarChartDataSet, label: WATER, 7 entries:
ChartDataEntry, x: 0.0, y 0.0
ChartDataEntry, x: 1.0, y 0.0
ChartDataEntry, x: 2.0, y 2133.0
ChartDataEntry, x: 3.0, y 1185.0
ChartDataEntry, x: 4.0, y 1185.0
ChartDataEntry, x: 5.0, y 1422.0
ChartDataEntry, x: 6.0, y 0.0

(lldb) po chartDataSet
Charts.BarChartDataSet, label: WATER, 7 entries:
ChartDataEntry, x: 0.0, y 0.0
ChartDataEntry, x: 1.0, y 0.0
ChartDataEntry, x: 2.0, y 2133.0
ChartDataEntry, x: 3.0, y 1185.0
ChartDataEntry, x: 4.0, y 1185.0
ChartDataEntry, x: 5.0, y 1422.0
ChartDataEntry, x: 6.0, y 0.0

(lldb) po barData.dataSets
▿ 1 element
▿ 0 : Charts.BarChartDataSet, label: WATER, 7 entries:
ChartDataEntry, x: 0.0, y 0.0
ChartDataEntry, x: 1.0, y 0.0
ChartDataEntry, x: 2.0, y 2133.0
ChartDataEntry, x: 3.0, y 1185.0
ChartDataEntry, x: 4.0, y 1185.0
ChartDataEntry, x: 5.0, y 1422.0
ChartDataEntry, x: 6.0, y 0.0

(lldb) po barData.contains(dataSet: chartDataSet)
false
```

When these two should be equal clearly from same content they fail. Any help is appreciated.

@danielgindi @liuxuan30