[ywei3410]

They require `sexp_of_t` and `t_of_sexp` because of their workflow being based on them; such as expectation testing [1] and tools such as [2]. It's a less noisy alternative to json for many people.

[1] https://blog.janestreet.com/testing-with-expectations/ [2] https://github.com/janestreet/sexp