[crznp]

var a=NaN, b=1; a<b ? -1 : (a>b ? 1 : 0); // 0

var a="a", b=1; a<b ? -1 : (a>b ? 1 : 0); // 0

The switch and if statements would return undefined in these cases. Or others threw an error if none of the conditions matched, that would work too.