read_sav default is to NOT encode user defined data

[tk27182]

When I load a dataset given to me from someone who made it using SPSS, and they encode certain negative values as different reasons for the value missing, I'd expect that those negative values to be shown by default. However, all those values are NA! After looking it up, I needed to set user_na = TRUE. Why is FALSE the default value for this argument? It seems setting it to TRUE is more intuitive.