encoding/json: mangled unmarshal string result [1.14 backport]

[gopherbot]

@dsnet requested issue #38105 to be considered for backport to the next 1.14 minor release.

@gopherbot, please open a backport issue for 1.14.

[mvdan]

The CL fixing this issue has been available since March - it's proving difficult to get the change properly approved during this time, so any help is appreciated. It would be a shame for it to get pushed back to 1.14.4 once again.

[dmitshur]

Approved as this is a Go 1.14-specific regression with no workaround.

[gopherbot]

Change https://golang.org/cl/233057 mentions this issue: [release-branch.go1.14] encoding/json: don't mangle strings in an edge case when decoding

[gopherbot]

Closed by merging 846c00e to release-branch.go1.14.