`paths(scalars)` bug?

Consider this JSON:

``` json
{
  "size": 2,
  "unsaf": false
}
```

The instructions `paths(scalars)` yield just

``` json
[
  [
    "size"
  ]
]
```

Whereas one might expect it should yield

``` json
[
  [
    "size"
  ],
  [
    "unsaf"
  ]
]
```

A bit of poking around makes me think the problem is when `false` is a value in a object.
