overloading of methods

[Tynukua]

Some times rpc API provide methods with optinal typing of parametr

if create another overloading of method in interface, only one implimentation created

source/app.d(5,1): Error: class `app.AutoJsonRpc!(IAPI).AutoJsonRpc` ambiguous virtual function `helloWorld`
source/app.d(5,1): Error: class `app.AutoJsonRpc!(IAPI).AutoJsonRpc` interface function `string helloWorld(int number, int number2)` is not implemented
source/app.d(40,20): Error: template instance `app.AutoJsonRpc!(IAPI)` error instantiating