[Moo] is Object.merge supposed to alter the objects that are passed to it?

[atom]

bit of unexpected behavior (which might be intentional).  When using
Object.merge the objects I pass in are being altered, unlike how
$merge used to behave.

old way:

var obj1 = {a: 1, b: 2, c: 3}
var obj2 = {d: 4, e: 5, f: 6}
var merged = $merge(obj1, obj2);
console.log(obj1); // returns {a: 1, b: 2, c: 3}

new way:

var obj1 = {a: 1, b: 2, c: 3}
var obj2 = {d: 4, e: 5, f: 6}
var merged = Object.merge(obj1, obj2);
console.log(obj1); // returns {a: 1, b: 2, c: 3, d: 4, e: 5, f: 6}