code: function converge(f, g, h, x) {
    if(!isFunction(f) || !isFunction(g) || !isFunction(h)) {
      throw new TypeError('converge: Functions required for first three arguments')
    }
  
    return curry(f)(g(x), h(x))
  }
docs: converge (Phoenix or Starling Prime) (b -> c -> d) -> (a -> b) -> (a -> c) -> a -> d