inserting `[]byte(nil)` to `bytea` is not treated as NULL

[koron]

this is not a bug report nor a feature request, just a question.

when I try to insert []byte(nil) as NULL like this, it was treated as 0 length bytea.
(you can see full source code at https://play.golang.org/p/6WBCgbtJKYS)

for _, b := range [][]byte{
	[]byte("hello"),
	[]byte("world"),
	nil, // this won't be stored as NULL.
} {
	_, err := db.Exec(`INSERT INTO foo1 (data) VALUES($1)`, b)
	if err != nil {
		return err
	}
}

Is this handling of []byte(nil) intentional?

[koron]

pq/conn.go

Line 1271 in 90697d6

if x == nil {

This never hit for []byte(nil), so it is encoded as 0 length value.

[mattn]

To check typed nil in right way, you need to use reflect.Value.IsNil()