do.call

`do.call` now this is pain...

```r
foo <- \(x) x + 1

# x won't be obfuscated because it's on the 
# right-hand side of call to list
do.call(foo, list(x = 41))

# the string literal "foo" refers to a function
# won't be obfuscated, it's treated as a string
do.call("foo", list(x = 41))
```