| Array.isArray(xi): true | |
| xi.length: 3 | |
| xi[1]: 1 | |
| post update -- xi[1]: 5 | |
| post update -- xi.length: 4 | |
| post update -- xi[3]: 10 | |
| post update -- xi[5]: undefined | |
| Array.isArray(xd): true | |
| xd.length: 3 | |
| xd[1]: 1.5 | |
| post update -- xd[1]: 5 | |
| post update -- xd.length: 11 | |
| post update -- xd[3]: 10 | |
| post update -- xd[5]: undefined | |
| post update -- xd[10]: 10 |