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Dune 3.9.1

In Dune 3.9.0, we added a feature that offloads some computations to background threads. Unfortunately, this has a bad interaction on macOS, where we fork processes to implement the RPC server and watch mode.

We marked Dune 3.9.0 unavailable on macOS, and released 3.9.1 with some mitigations: we don't offload these computations on macOS, and we only fork when necessary.

The plan for the next release is to stop forking processes on macOS.

See full changelog

Fixes

  • Disable background operations and threaded console on macOS and other Unixes where we rely on fork. (#8100, #8121, fixes #8083, @rgrinberg, @emillon)

  • Initialize async I/O thread lazily. (#8122, @emillon)