pub external fn from_list(list: List(t)) -> MutableMap(k, v)

pub external fn get(
  map: MutableMap(k, v),
  key: k,
) -> Result(v, Nil)

pub fn insert(map: MutableMap(a, b), key: a, value: b) -> MutableMap(
  a,
  b,
)

pub external fn keys(map: MutableMap(k, v)) -> List(k)

pub external fn new() -> MutableMap(k, v)