bool[] ba = [1,0];
bool[] bb = [0,1,0];

auto a = BitArray(ba);
auto b = BitArray(bb);
BitArray c;

c = (a ~ b);
assert(c.length == 5);
assert(c[0] == 1);
assert(c[1] == 0);
assert(c[2] == 0);
assert(c[3] == 1);
assert(c[4] == 0);

c = (a ~ true);
assert(c.length == 3);
assert(c[0] == 1);
assert(c[1] == 0);
assert(c[2] == 1);

c = (false ~ a);
assert(c.length == 3);
assert(c[0] == 0);
assert(c[1] == 1);
assert(c[2] == 0);