Should opIndex completely override alias this?

[Trass3r]

As soon as you define an opIndex, alias this isn't considered anymore.
Is this wanted behavior?

I'd have expected this to work:

	T[] data;
	T opIndex(size_t i, size_t j)
	{
		return data[i*numCols+j];
	}
	alias data this;

Then dynmap[3] would work by using data directly.
But: opIndex (ulong i, ulong j) is not callable using argument types (int)