This version is used with pgx v4. In pgx v5 it is part of the https://github.com/jackc/pgx repository.

pgtype

pgtype implements Go types for over 70 PostgreSQL types. pgtype is the type system underlying the https://github.com/jackc/pgx PostgreSQL driver. These types support the binary format for enhanced performance with pgx. They also support the database/sql Scan and Value interfaces and can be used with https://github.com/lib/pq.