Right now, if you have a bar chart selected and plot a quantitative variables vs. another quantitative variable, the x quantitative variable is plotted as a nominal variable. Instead, switch the chart type to a scatterplot and force the user to explicit select bar chart if they want this quant-to-nominal transformation to happen. This is simply the best default to show 2 quantitative variables in a chart.
Right now, if you have a bar chart selected and plot a quantitative variables vs. another quantitative variable, the x quantitative variable is plotted as a nominal variable. Instead, switch the chart type to a scatterplot and force the user to explicit select bar chart if they want this quant-to-nominal transformation to happen. This is simply the best default to show 2 quantitative variables in a chart.