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Joe Tsai 2763146099 encoding/json: encode \b and \f as '\b' and '\f' in JSON strings
According to RFC 8259, there are exactly 5 control characters
that have a shorter escape sequence than the generic \uXXXX format.

Over the years, we added ad-hoc support for the short sequences:
* https://go.dev/cl/4678046 supports \r and \n
* https://go.dev/cl/162340043 supports \t

This CL completes the set by supporting \b and \f.

This may change the encoding of strings in relatively rare cases,
but is a permissible change since the Go 1 compatibility document does
not guarantee that "json" produces byte-for-byte identical outputs.

In fact, we have made even more observable output changes in the past
such as with https://go.dev/cl/30371 which changes the representation
of many JSON numbers.

This change is to prepare the path forward for a potential
v2 "json" package, which has more consistent encoding of JSON strings.

Change-Id: I11102a0602dfb1a0c14eaad82ed23e8df7553c6b
Reviewed-on: https://go-review.googlesource.com/c/go/+/521675
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Joseph Tsai <joetsai@digital-static.net>
Reviewed-by: Bryan Mills <bcmills@google.com>
2023-08-23 21:37:55 +00:00
.github .github: fix templates with multiple labels 2023-07-31 18:28:27 +00:00
api encoding: add AppendEncode and AppendDecode 2023-08-17 16:23:42 +00:00
doc spec: clarify that []byte("") must be non-nil 2023-08-21 23:20:08 +00:00
lib/time lib/time: update to 2023c/2023c 2023-05-03 20:14:11 +00:00
misc os: add tests for UserCacheDir and UserConfigDir 2023-08-21 17:46:57 +00:00
src encoding/json: encode \b and \f as '\b' and '\f' in JSON strings 2023-08-23 21:37:55 +00:00
test cmd/compile/internal/noder: elide statically known "if" statements 2023-08-23 18:01:55 +00:00
.gitattributes
.gitignore internal/platform,cmd/dist: export the list of supported platforms 2023-06-22 19:44:52 +00:00
codereview.cfg
CONTRIBUTING.md doc: normalize proposal-process links 2023-03-29 22:00:27 +00:00
go.env cmd/go: additional doc-inspired tests and bug fixes 2023-06-06 19:18:46 +00:00
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