Here’s something in the PDF of the pspp manual that I couldn’t figure out reliably. See Section 9.4.2 Postgres Database Queries. The sentence fragment is “Postgres data types of high precision, loose precision when imported into PSPP.” Perhaps that “when” needs to be fixed, e.g., “can/cannot be imported.” Or maybe more needs to be added at the end of the sentence, e.g. “into PSPP become [something else].” Or maybe the issue is around “loose precision, e.g., “converted to loose precision when imported.” I’m not sure.
In any event, I think that part of the documentation needs some editing to make the situation clear.