CombinedChartView with multiple line data sets

Feature Request:
It is possible to display one line data set in a CombinedChartView or multiple in a LineChartView, however, I am unable to display multiple lineDataSets along a barDataSet?

Start by reading the CombinedChartView and LineChartView entry points to compare how their data sets are accepted and rendered. Verify the existing single-line and bar-plus-line behavior, then define done as displaying multiple lineDataSets alongside a barDataSet in a CombinedChartView without regressing the existing chart modes.

Written by the indexing model from the issue text.