jashkenas/underscore — pull request #1585 by MikeBazhenov (2014-04-16 07:52:06+00:00)
Title: Deep extend

Hello!
This commit added new function, for extending big object as:

```js

var source = {
auto: 1,
moto: 1,
boat: {
fly: 0,
cry: 1,
subkey: {
//... and so on
}
}
}

var object = {
auto: 0,
moto: 1,
boat: {
fly: 1,
cry: 0,
dry: {
subkey: {
//... and so on
}
},
subkey: {
//... and so on
}
}
}

```