code in swift readme will not compile

[elements-of-boredom]

I'm not sure if its due to Swift 1.2 however in step 12 the below code results in "Cannot assign to the result of this expression"
rev["check"] = !wasChecked
I believe rev.properties["check"] = !wasChecked is either what was meant to be, or now needs to be.

Also in step 13, when properties is declared it needs to be explicitly declared as a Dictionary or by default its created as NSDictionary and requires casting when passed into doc.putProperties