0. Array: default
1,2,,3


1. Array: Replaced Array.prototype.join
replaced Array.prototype.join


2. Array: Replaced non-callable Array.prototype.join
[object Array]


3. Object: no join
[object Object]


4. Object: has join
o join


5. Object: non-callable join
[object Object]


6. Object: no join, replaced Object.prototype.toString
[object Object]