Bug #5474 cannot run a stored procedure populating mysqlcommand.parameters

Description:
When a stored procedure is called using a mysqlcommand
- populating its parameters collection -
an error occurs:
#42000Incorrect number of arguments for PROCEDURE sp_test; expected 1; got 0

this is the stack trace for mysqlexception object:
   at MySql.Data.MySqlClient.Driver.ReadPacket()
   at MySql.Data.MySqlClient.Driver.Send(DBCmd cmd, Byte[] bytes)
   at MySql.Data.MySqlClient.InternalConnection.ExecuteCmd(DBCmd cmd, Byte[] buffer, Boolean consume)
   at MySql.Data.MySqlClient.MySqlCommand.GetNextResultSet(MySqlDataReader reader)
   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader()
   at WindowsApplicationTest.Form1.button1_Click(Object sender, EventArgs e) in c:\\documents and settings\\elabora_46\\documenti\\progetti di visual studio\\windowsapplicationtest\\form1.cs:line 261

mysql server version: 5.0.1 alpha.
The sp functions correctly into mysql client.

How to repeat:
create this simple stored procedure on MySql Server 5.0.1 alpha:
CREATE PROCEDURE sp_test(par0 int)
begin
	select par0;
end

then run this code:

MySqlConnection cn = new MySqlConnection();
cn.ConnectionString = "Data Source=localhost;database=testdb;";
cn.Open();

MySqlCommand cm = new MySqlCommand();
cm.CommandType = CommandType.StoredProcedure;
cm.Connection = cn;
cm.CommandText = "sp_test";
cm.Parameters.Add("par0", MySqlDbType.Int32).Value = 3;

MySqlDataReader dr = cm.ExecuteReader(CommandBehavior.SingleResult);

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