Are +0 and -0 the same?

Question

Reading through the ECMAScript 5.1 specification, +0 and -0 are distinguished.

Why then does +0 === -0 evaluate to true<

Answer 1

We can use Object.is to distinguish +0 and -0, and one more thing, NaN==NaN.

Object.is(+0,-0) //false

Object.is(NaN,NaN) //true