Duplicate primary keys after type_2_scd_upsert (maybe)

[v01t6]

Hello,

We came across a bug in your code (I think). You have to call the function type_2_scd_upsert with the same data, and you get incorrect behaviour (in my opinion). It is simple to induce. An example is shown below, where INVLDT_LVL_KEY is the primary key:

Original dataframe:

Updating dataframe:

After update (bug?):

Desired outcome?

We are using mack 0.2.0.

Thanks for your feedback.