clientRpc array of System.object loss object type and can't cast the objects

Hi everyone, I try to create a generic method for a clientRpc function so i tried something like that :

     [ClientRpcAttribute]
     private void RpcCall(object[] parameters)

I tried that but all the object in parameters lost their type and cast give me an error (cannot cast from source type to destination type). But i can cast and get the type of the object in the main (just before call RpcCall). I tried many types and always the same i can't do anything with the object i obtain (and object.type return error too). So have you an idea or maybe an other solution? Thanks!