Fallback to other format when encoding query arguments

The preferred format may not be possible for certain arguments. For
example, the preferred format for numeric is binary. But if
shopspring/decimal is being used without jackc/pgx-shopspring-decimal
then it will use the database/sql/driver.Valuer interface. This will
return a string. That string should be sent in the text format.

A similar case occurs when encoding a []string into a non-text
PostgreSQL array such as uuid[].

query_test.go

@@ -1165,7 +1165,7 @@ func TestConnQueryDatabaseSQLDriverValuerWithAutoGeneratedPointerReceiver(t *tes
 	ensureConnValid(t, conn)
 }
 
-func TestConnQueryDatabaseSQLDriverValuerWithBinaryPgTypeThatAcceptsSameType(t *testing.T) {
+func TestConnQueryDatabaseSQLDriverScannerWithBinaryPgTypeThatAcceptsSameType(t *testing.T) {
 	t.Parallel()
 
 	conn := mustConnectString(t, os.Getenv("PGX_TEST_DATABASE"))
@@ -1181,6 +1181,26 @@ func TestConnQueryDatabaseSQLDriverValuerWithBinaryPgTypeThatAcceptsSameType(t *
 	ensureConnValid(t, conn)
 }
 
+// https://github.com/jackc/pgx/issues/1273#issuecomment-1221672175
+func TestConnQueryDatabaseSQLDriverValuerTextWhenBinaryIsPreferred(t *testing.T) {
+	t.Parallel()
+
+	conn := mustConnectString(t, os.Getenv("PGX_TEST_DATABASE"))
+	defer closeConn(t, conn)
+
+	arg := sql.NullString{String: "1.234", Valid: true}
+	var result pgtype.Numeric
+	err := conn.QueryRow(context.Background(), "select $1::numeric", arg).Scan(&result)
+	require.NoError(t, err)
+
+	require.True(t, result.Valid)
+	f64, err := result.Float64Value()
+	require.NoError(t, err)
+	require.Equal(t, pgtype.Float8{Float64: 1.234, Valid: true}, f64)
+
+	ensureConnValid(t, conn)
+}
+
 func TestConnQueryDatabaseSQLNullX(t *testing.T) {
 	t.Parallel()