StaticBitArray.opApply

static bool[] ba = [1,0,1];
auto a = StaticBitArray!3(ba);
size_t i;
foreach (immutable b; a[]) /+ TODO: is `opSlice` the right thing? +/
{
	switch (i) {
	case 0: assert(b == true); break;
	case 1: assert(b == false); break;
	case 2: assert(b == true); break;
	default: assert(0);
	}
	i++;
}
foreach (j, b; a)	   /+ TODO: is `opSlice` the right thing? +/
{
	switch (j) {
	case 0: assert(b == true); break;
	case 1: assert(b == false); break;
	case 2: assert(b == true); break;
	default: assert(0);
	}
}