Parameter storage class affects the PGType

[tapg24]

Good:
Nullable!User getUser(int _user_id)
{
auto conn = m_pgdb.lockConnection();
auto cmd = new PGCommand(conn, "SELECT user_id, username, email FROM users WHERE user_id = $1;");
cmd.parameters.add(1, PGType.INT4).value = _user_id;
..
}

Exception:
Nullable!User getUser(in int _user_id)
{
auto conn = m_pgdb.lockConnection();
auto cmd = new PGCommand(conn, "SELECT user_id, username, email FROM users WHERE user_id = $1;");
cmd.parameters.add(1, PGType.INT4).value = _user_id;
..
}

ddb.postgres.ParamException@C:\Users\pavel\AppData\Roaming\dub\packages\ddb-0.2.3\source\ddb\postgres.d(842): Parameter's value is not convertible to int