Number array parameter parsed as string array

I am not able to use an array of numbers as a parameter

var keep = [1, 2, 3]

// this does not work
client.query('delete from foo where key_one=$1 and key_two not in($2)', [id, keep], function(err, result) {
    // handle result
})

gives this error

invalid input syntax for integer: "{"1","2","3"}"

[thom4parisot]

@camsteffen you mean is replacing field IN (<array_of_int>) by field = ANY(<array_of_int>) is what makes it work? Very subtle. Thank you 😃

[camsteffen]

I figured it out. My query was formed wrong but it is actually possible to use a number array as a parameter.

var keep = [1, 2, 3]
client.query('delete from foo where key_one=$1 and not key_two = any($2)', [id, keep], function(err, result) {
    // handle result
})