visitAssignment: can I get the "full name" of the LHS?

I'm trying to detect assignments such as

```
CSL.XmlJSON.prototype.children = function() { ... }
```

how can I reconstruct the `CSL.XmlJSON.prototype.children` left hand side when i'm in `visitAssignment`?

The issue names visitAssignment as the entry point; start there and inspect how the assignment node exposes its left-hand side. Done means determining whether the qualified name can be reconstructed and documenting or implementing the supported approach, with any relevant tests identified during that investigation.

Written by the indexing model from the issue text.