Error when configuring like examples

[Kyle Boe]

Elixir 1.12.3
Phoenix 1.5.12
Vapor 0.10.0

I haven't dug into why this error is now happening but when configuring like the example here:

defmodule VaporExample.Config do
  use Vapor.Planner

  dotenv()

  config :db, env([
    {:url, "DB_URL"},
    {:name, "DB_NAME"},
    {:pool_size, "DB_POOL_SIZE", default: 10, map: &String.to_integer/1},
  ])

  config :web, env([
    {:port, "PORT", map: &String.to_integer/1},
  ])

  config :kafka, VaporExample.Kafka
end

defmodule VaporExample.Application do
  use Application

  def start(_type, _args) do
    config = Vapor.load!(VaporExample.Config)

    children = [
       {VaporExampleWeb.Endpoint, config.web},
       {VaporExample.Repo, config.db},
       {VaporExample.Kafka, config.kafka},
    ]

    opts = [strategy: :one_for_one, name: VaporExample.Supervisor]
    Supervisor.start_link(children, opts)
  end
end

I get the following error:

(FunctionClauseError) no function clause matching in Keyword.get/3

Turns out, the issue is resolved by changing the children configuration lines to first convert to a Keyword List instead of a Map like so:

{VaporExampleWeb.Endpoint, Map.to_list(config.web)},
{VaporExample.Repo, Map.to_list(config.db)},

A solution might be adding a function like Vapor.load_list!() to load the config as a Keyword List. Thoughts?