pg_server_version doesn't work with PostgreSQL-10.x
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PostgreSQL developers switched from 3-part to 2-part version numbers stating with 10.x and pg_server_version does not work (returns 0). It needs to handle 3-part (x.y.z = xxyyxx) and 2-part (x.y = xx00yy) versions. See PostgreSQL-10 documentation for PQserverVersion.
Fixed in 3.5.1 - pg_server_version will work with 2-part and 3-part versions.