Revamping associative arrays

[bearophile]

bearophile:
> That you can use for example like this, to give an empty AA to a foo() function:
> foo(AA!(int, float));

I have just found that you can also use "null" there. It's less explicit because if you take a look at the call site only, you don't know that the receiver will need an AA.

That's why I'd like to disallow "null" to be used where an empty array can be given (and force the programmer to use [] there). This is also how Delight language works.

Bye,
bearophile