Arrays broken before function call elements

When breaking an array, yapf appears to treat array elements that are function calls differently from those that are not:

$ cat issue.py
array = [first, make_second(), third, fourth, fifth, make_sixth(), seventh, eighth]
$ yapf issue.py
array = [
first,
make_second(), third, fourth, fifth,
make_sixth(), seventh, eighth
]

This seems very strange to me. I'm not sure whether it's intended behavior or a bug, because I couldn't find a test for it or configuration option to disable it (I'd like to).

I would have expected either:

array = [
first, make_second(), third, fourth, fifth, make_sixth(), seventh, eighth
]

or:

array = [
first,
make_second(),
third,
fourth,
fifth,
make_sixth(),
seventh,
eighth
]

(ideally option A, I think; you can get option B already by adding a trailing slash)