dictionary(..., toLower = TRUE) not working

```r
> dictionary(list(one = c("a, b"), TWO = "C"), toLower = FALSE)
Dictionary object with 2 key entries.
 - one: a, b
 - TWO: C
> dictionary(list(one = c("a, b"), TWO = "C"), toLower = TRUE)
Dictionary object with 2 key entries.
 - one: a, b
 - TWO: C
```

argument has no effect. This is true in most importers using `file = ` as well.