What is the result type of the Promise returned by get()?

[cdumez]

What is the result type of the Promise returned by get()? The spec is not clear about this. It is likely a value (of 'any' type) if only 1 id is given and an array of values (any[]) if several ids are requested.

One issue is also, what is supposed to happen if several ids are requested but some of them do not exist in the database? 2 solutions are possible:

• The whole thing fails and the Promise returns an error
• We fallback nicely and return the objects whose ids actually exist. But then, it is not obvious to the user which ids actually succeeded.