Add float4, float8 and arrays

pgtype/pgtype_test.go

@@ -18,6 +18,8 @@ type _int16 int16
 type _int16Slice []int16
 type _int32Slice []int32
 type _int64Slice []int64
+type _float32Slice []float32
+type _float64Slice []float64
 
 func mustConnectPgx(t testing.TB) *pgx.Conn {
 	config, err := pgx.ParseURI(os.Getenv("DATABASE_URL"))