When creating a calculated metric, we are given the option on how many decimal places. This setting only applies to the UI in function as any export of the data via CSV shows the decimal equivalent. The exported data should match the UI/setting for the calculated metric.
For example, we are using the Approximate Count Distinct (dimension) for one of our variables. While we appreciate the complex algorithm used to come up with this calculated metric, the option of setting number of decimal places should continue no matter how the metric is consumed.