module HTTPX
  type bodyIO = _Reader | _Each[[String, untyped]] | _ToS

  module Transcoder
    def self?.registry: (String tag) -> _Encode
                   | () -> Hash[String, _Encode]

    def self?.register: (String tag, _Encode handler) -> void
                     
    def self?.normalize_keys: (_ToS key, _ToAry[untyped] | _ToHash[_ToS, untyped] | untyped value) { (String, ?untyped) -> void } -> void
                           | (_ToS key, untyped value, Proc? cond) { (String, untyped) -> void } -> void

    interface _Encode
      def encode: (untyped payload) -> (_Encoder | _Each[String])
    end

    interface _Encoder
      def bytesize: () -> Numeric
    end

    interface _Decoder
      def decode: (string) -> String
    end
  end
end