Sort out happy flows for fastest execution for expected types
Sort out happy flows for fastest execution for expected types

* double for GetDouble
* float for GetFloat
* decimal for GetDecimal

Signed-off-by: Daniel Cohen Gindi <da231c6cc32d17c7b981a078b3525a212c7ba6d1@gmail.com>

mysql-net/MySqlConnector,mysql-net/MySqlConnector