| Testing object 0............ | |
| obj[0] instanceof proto[0] : true | |
| obj[0] instanceof proto[1] : false | |
| Testing object 1............ | |
| obj[1] instanceof proto[0] : false | |
| obj[1] instanceof proto[1] : true | |
| Checking properties ......... | |
| obj[0].z : proto[0].z | |
| obj[0].w : proto[0].w | |
| obj[1].z : undefined | |
| obj[1].w : undefined |