Bug when threshold is set as an array

[cadilhac]

I use your library like this:

ioa.observe(self.value, {
		root: self.value.parentNode,
		threshold: [0, 1]
	})

Your areOptionsSame function does not succeed comparing 2 arrays (threshold) that have the same values (index.ts, line 372).

this.areOptionsSame(a[key], b[key])

returns false when comparing [0,1] and [0,1]

This happens on line 364:

else if (type1 !== '[object Object]' && type2 !== '[object Object]') {
      return a === b;
}

because [0,1] === [0,1] returns false.

The net result is that my callbacks are never called.

Thanks.