When copying a csv file into a table, ifthere is a string missing a double quote in the end, COPY will return an error saying the string is infinitely long. But placing quote '''' (quote and four single quotes) resolves the issue. The documentation does not explain why that mechanism would work, and instead refers to fixing the csv file.
You might want to explain this with examples. Even if what you are saying works at face value it seems more likely accidental rather than something we'd want to document. Or, it falls under "fixing the csv file" - the details of which we are unlikely to try and describe.