There should be a different as.character.factor

So that at least the names attribute is preserved:

```
> as.character(as.factor(c(a=1, b=2)))
[1] "1" "2"
> as.factor(c(a=1, b=2))
a b
1 2
Levels: 1 2
```

Start at the as.character.factor entry point and reproduce the example in the issue to inspect the current handling of factor names. Determine the package's existing test location for this conversion, then add coverage showing that names are preserved when converting a factor; done means the example retains names a and b.

Written by the indexing model from the issue text.