我们会在这个 Issue 中持续 refer 比较典型的 Issue，也希望您能持续通过 issue 来与我们讨论各种问题，这样都可以为其他人提供参考，也避免我们重复回答同样的问题。

• 如果您刚开始接触 RQAlpha 请先阅读文档 http://rqalpha.io
• 如果您在使用过程中遇到了问题，请先查看下文罗列的FAQ是否可以解决您的问题，或者您也可以利用 Issue 的搜索和过滤功能来试图找到类似问题的讨论。
• 如果以上方式仍然没有解决您的问题的，请您 创建Issue, 按照创建时给出的规范模板来描述您的问题
• 善用截图功能，github 上是可以在 issue 的提问和回复中直接 ctrl + v 来上传图片的，很方便。

RQAlpha 2.0.0

https://github.com/malcommac/Hydra/blob/d12500aaf1685b338231f03cdfa49c4aa01858a3/README.md
in README.md, retry is written twice in line 20.It is good to match because the order is different from Index.

https://github.com/malcommac/Hydra/blob/d12500aaf1685b338231f03cdfa49c4aa01858a3/README.md#all-features
There is no retry in All Feature.

Do you think it's necessary at this stage?

@jonhoo @tikue

• Explain | syntax
• Write more about services and clients and when you might return what errors. Have some examples.
• Make it more clear that service implementations must be Clone/Send/'static
  • Add to the readme
  • Add to the macro documentation if it's not there
• Warn of the dangers of mixing FutureService with SyncClient
  • Namely, if the client runs on

Add 'Best Practices For Package Developers using Futures' vignette with instructions on, for instance,

1. How to test code, e.g. run tests with plan(sequential) and plan(multisession) and don't assume that plan(multicore) is available.

2. Make sure to shut down PSOCK clusters at the end of examples and package tests, i.e. call plan(sequential) at the end (e.g. #327)

3. Avoid setti

Given an array / iterator, returns a new Array of only Some or Left or Right values.

References:

• catMaybes from Haskell
• rights
• lefts
• [catOptions](https://github

At the moment the producer will provide a copy of the message to the underlying librdkafka client. Rust-rdkafka should provide a method that takes ownership of the message and gives it in non-copy mode to librdkafka, saving one allocation/free.

From https://discuss.ocaml.org/t/lwt-how-to-catch-exceptions-raised-by-signal-handlers/565:

open Lwt.Infix

let () =
  Lwt_unix.on_signal
    Sys.sigint
    (fun _ ->
      failwith "Caught SIGINT")
  |> ignore;

  let p =
    Lwt.finalize
      (fun () ->
        Lwt_unix.sleep 2. >>= fun () ->
        raise Pervasives.Exit)
      (fun () -

Hi! It'd be nice to have canonical examples on how to use andThen. There was recently an extended Slack chat about using andThen, with suggestions about defeating type inference, the use of try causing odd errors, and then questions on how to propagate errors out in to the result that anyone who upons peels apart. It'd be nice if there were a canonical example of its use we can crib fro