construct from dynamic array
static bool[] ba = [1,0,1,0,1]; auto a = StaticBitArray!5(ba); assert(a); assert(!a.allZero);
ditto
static bool[] ba = [0,0,0]; auto a = StaticBitArray!3(ba); assert(!a); assert(a.allZero);
construct from static array
static bool[3] ba = [0,0,0]; auto a = StaticBitArray!3(ba); assert(!a); assert(a.allZero);