Adding "expression" type handling for Collection type propereties

I need a clarification regarding the behaviour of the updated Collection Editor, in particular for this section -->https://marvelapp.com/5ab248j/screen/62093042/layer/102496330.

Considering the editor introduces a new way to handle a Collection ("Define List"), can you please give us detailed behaviour for the following case:

• What happen if a user starts to input data inside a section (Define List/Create List) and then switch on the other one?
  eg. if I start to define a List using "Define List" option (i.e. an expression) and then I change to "Create List" case. What should happen?
• Currently, after adding a Collection, the Grid cell will show "List (1)". It should be the same for "Define list" (i.e. Expression) case?

In case of additional clarificaiton, I'll update this ticket.

Hope it's clear, if not you can contact me anytime.
Thanks