`sqrt(...)` seems to misbehave


```console
> log(sqrt(10),2)
1.6609640474
> log(sqrt(10,2))   # even though sqrt only takes 1 argument
6.6438561898
> log(sqrt(10,2     # this has the same behaviour
6.6438561898
> log(sqrt(sqrt(10,2)))
13.2877123795
```

`log(sqrt(10, 2))` behaves like `log(100, 2)`, `log(sqrt(sqrt(10, 2)))` behaves like `log(1000, 2)` etc.