ZTransducer is an effectful chunk processing function, and thus forms an arrow. We should add the following combinators on it:

• zipping: (ZTransducer[A, B], ZTransducer[A, C]) => ZTransducer[A, (B, C)]
• racing: (ZTransducer[A, B], ZTransducer[A, C]) => ZTransducer[A, Either[B, C]] looks problematic to implement currently
• both: `(ZTransducer[A, C], ZTransducer[B, D]) => ZTr

@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

bug in README.md when_all_ready() example:

task<> example2()
{
...
// Unpack and handle each result individually once they're all complete.
for (int i = 0; i < 1000; ++i)
{
try
{
>>> std::string& record = tasks[i].result();
should be
std::string& record = resultTasks[i].result();
...
}

Hi Dan 👋 Thanks a lot for the library, I’m using it in a modern Mac app and cannot be happier.

I’m curious about callbacks when the procedure is cancelled or finished with an error. So what is the best practice to handle all events once the job is done?

I always did something like this (os_log is a placeholder, treat it as UI updates):

let job = MyAsyncProcedure()
job.addDidC

Some patterns should be avoided when writing programs with P# (especially as some of them can break our controlled testing infrastructure). We should make sure to document these.

The descriptions for these sub-projects are missing descriptions in both the root README.md as well as their respective readme files

I've disabled chronos on OSX from important_packages in nim-lang/Nim#13954 because CI for chronos fails on OSX:

https://dev.azure.com/nim-lang/255dfe86-e590-40bb-a8a2-3c0295ebdeb1/_apis/build/builds/4234/logs/76

2020-04-11T13:10:46.5530120Z �[1m�[31mFAIL: �[36mhttps://github.com/status-im/nim-chronos C�[0m
2020-04-11T13:10:46.5530940Z �[1m�[36mTest "https://gi