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[release-branch.go1.14] doc/go1.14: document json.Umarshal map key support of TextUnmarshaler 

Document that json.Unmarshal supports map keys whose underlying
types implement encoding.TextUnmarshaler.

Updates #38801.
Fixes #38904.

Change-Id: Icb9414e9067517531ba0da910bd4a2bb3daace65
Reviewed-on: https://go-review.googlesource.com/c/go/+/237857
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
(cherry picked from commit 47b4509977)
Reviewed-on: https://go-review.googlesource.com/c/go/+/252617
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
This commit is contained in:
ShihCheng Tu 2020-06-15 00:07:10 +08:00 committed by Carlos Amedee
parent 2cab203bda
commit 404635c2eb
1 changed files with 6 additions and 0 deletions
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doc/go1.14.html
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@ -609,6 +609,12 @@ Do not send CLs removing the interior tags from such phrases.
If a program needs to accept invalid numbers like the empty string,
consider wrapping the type with <a href="/pkg/encoding/json/#Unmarshaler"><code>Unmarshaler</code></a>.
</p>
<p><!-- CL 200237 -->
<a href="/pkg/encoding/json/#Unmarshal"><code>Unmarshal</code></a>
can now support map keys with string underlying type which implement
<a href="/pkg/encoding/#TextUnmarshaler"><code>encoding.TextUnmarshaler</code></a>.
</p>
</dd>
</dl><!-- encoding/json -->