Problems with nested params

It seems to have problems with params like this:

```js
/**
* @param {object} thing
* @param {object[]} thing.stuff
* @param {string} thing.stuff[].name
* @param {number} thing.stuff[].index
*/
```

It seems to interpret everything from `thing.stuff` as `thing.stuff` and doesn't dive lower than that.

Start by reproducing the JSDoc example from the issue and trace how nested parameter paths are parsed and converted into assertions. Done means properties under thing.stuff, including each item's name and index, are handled at their nested paths rather than being treated as one path.

Written by the indexing model from the issue text.