The behavior is accepted widely, and I found no reason to deny it.

Fixes golang/go#57285

Change-Id: I39b07295cc89481ea0d6b70b71f2aa57f1a01407
GitHub-Last-Rev: b00ecb1
GitHub-Pull-Request: #157
Reviewed-on: https://go-review.googlesource.com/c/net/+/457355
Run-TryBot: Damien Neil <dneil@google.com>
Auto-Submit: Damien Neil <dneil@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>