`Object.is(JSON.parse('-0'), -0)` should evaluate to `true`. It's currently `false` in XS. ``` $ eshost -se 'Object.is(JSON.parse("-0"), -0)' #### Chakra, JavaScriptCore, SpiderMonkey, V8, V8 --harmony true #### XS false ``` See https://github.com/tc39/ecma262/pull/1466.