Have a better autocomplete system

[remyleone]

Description

We should avoid using type cast for autocomplete because it makes the system quite brittle in case we are using custom type. Beside it is quite cumbersome to have to cast explicitely performed everytime.

We should use a generic feature to have strong typing at the moment where we call autocomplete. We should not rely on explicit cast.

A linter like forcetypeassert won't fix much. We need to find a deeper solution.

We should also look for impact on performance for autocomplete.