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doc: document removal of asynctimerchan GODEBUG setting (update release notes)

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For #76472.

Change-Id: I1f470cee6b845e4d1fe4d48fd37ac11bbea26fda
Reviewed-on: https://go-review.googlesource.com/c/go/+/783421
Reviewed-by: Robert Griesemer <gri@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
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Robert Griesemer 2026-05-26 16:11:10 -07:00 committed by Gopher Robot
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commit c74c040511
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doc/next/4-runtime.md
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@ -8,3 +8,9 @@ the header line. This behavior can be disabled with `GODEBUG=tracebacklabels=0`
(added in [Go 1.26](/doc/godebug#go-126)). This opt-out is expected to be
kept indefinitely in case goroutine labels acquire sensitive information that
shouldn't be made available in tracebacks.
<!-- CL 781580 -->
The `asynctimerchan` GODEBUG setting (added in [Go 1.23](/doc/godebug#go-123))
has been removed permanently. Channels created by package [time](https://pkg.go.dev/time)
are now always unbuffered (synchronous), irrespective of GODEBUG settings.