Use triple equals for dates

[JamesGelok]

Not sure what would need to be coerced here, triple equals might help ensure a more accurate diff.

sample source

const date1 = new Date(Date.UTC(96, 1, 2, 3, 4, 5));

console.log(date1.valueOf());
// expected output: 823230245000

const date2 = new Date("02 Feb 1996 03:04:05 GMT");

console.log(date2.valueOf());
// expected output: 823230245000

After looking at this I'm thinking we should use triple equals here.

console.log(date1.valueOf() === date2.valueOf());
// expected output: true

[coveralls]

Coverage remained the same at 100.0% when pulling 49e6212 on JamesGelok:patch-1 into 6296889 on mattphillips:master.