Use this function to turn on data-stacking. If $stackWhat is supplied only specific data-types will be stacked. Please note that possibly not all data-types might support stacking, in which case they will simply be left unstacked. But the base-types "bar" and "line" do support it! If you use both Y-axes then only data on the same axis can be stacked (sure!). So if you have e.g. line-data on both axes they will be stacked independently.
Parameter
string / array $stackWhat
name or array of names of data-types you want to be stacked
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