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@SeanTAllen SeanTAllen released this 07 Apr 23:00

0.13.0 is a high priority release recommended for all Pony users. #1868 fixes a type system problem identified by Paul Liétar. Paul is currently working on verifying the Pony type system as part of his final year project at Imperial College. Expect to see more high priority releases as we fix problems that Paul identifies.

There is also a breaking change in 0.13.0. RFC #41 was implemented and merged to master. The received method on TCPConnectionNotify now takes an additional parameter. For any of your code, if you previously had:

fun ref received(conn: TCPConnection ref, data: Array[U8] iso): Bool

You'll need to update your method signature to be:

fun ref received(conn: TCPConnection ref, data: Array[U8] iso, times: USize): Bool

It's safe to ignore the times parameter unless you need more fine-grained control over how a TCPConnection interacts with the Pony scheduler.

[0.12.3] - 2017-04-07


  • Do not allow capability subtyping when checking constraint subtyping. (PR #1816)
  • Allow persistent map to use any hash function (PR #1799)


  • Pass # of times called to TCPConnectionNotify.received (PR #1777)