byKey and byValue: properties or methods?

[torhu]

On 19.01.2012 19:17, Steven Schveighoffer wrote:
>
> That's like saying this:
>
> int[] arr;
>
> int l = arr.length;
> l++;
>
> should be the same as this:
>
> arr.length++;
>
> because it's a property.
>
> This is an orthogonal problem.  byKey doesn't try to affect the original
> AA, so the semantics should be the same whether you save a copy or access
> it in one line.
>
> There are no hard-fast rules on what should be properties and what
> shouldn't.  But the rvalue vs lvalue is an orthogonal problem.

If the type of byKeys is Range, I would expect to be able to treat it 
like one.  Not like one, then another, then another, then another... ad 
infinitum.