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cc3c9bd871
afed3ceremoved the sys/unix package and moved over to sys/posix, it has new bindings for the pthread APIs but should have been equivalent (not).8fb7182used `CANCEL_ENABLE :: 0`, `CANCEL_DISABLE :: 1`, `CANCEL_DEFERRED :: 0`, `CANCEL_ASYNCHRONOUS :: 1` for Darwin, while the correct values are `1`, `0`, `2` and `0` respectively (same mistake was made for FreeBSD in that commit). What this meant is that the `pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS)` was not actually successful, but because the error wasn't checked it was assumed it was. It also meant `pthread_setcancelstate(PTHREAD_CANCEL_ENABLE)` would actually be setting `PTHREAD_CANCEL_DISABLE`. The code in this PR restores the behaviour by now actually deliberately setting `PTHREAD_CANCEL_DISABLE` and not setting `PTHREAD_CANCEL_ASYNCHRONOUS` which was the previous behaviour that does actually seem to work for some reason. (I also fixed an issue in fmt where `x` would use uppercase if it was a pointer.)