pub const decode: fn(value.Value(a, b)) -> Result(
  String,
  break.Reason(a, b),
)

pub fn encode(arg: Nil) -> value.Value(a, b)

pub const label: String

pub fn lift() -> isomorphic.Type(a)

pub fn lower() -> isomorphic.Type(a)

pub fn sync(message: String) -> Nil