csuwldcat/mootools-core — comment on commit 2bdbd434e272def2085df7988958e315d329cb02
File:  line 0
By ibolmo:

Not necessarily, only when it makes sense. In this case we've had a couple of requests for a deep substitute:

``` javascript
'{a.b.c}'.substitute({a: {b: {c: 1}}});
```