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encoding/json: some strings aren't marshaled/unmarshaled correctly #9068

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gopherbot opened this issue Nov 7, 2014 · 2 comments
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@gopherbot
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by slunk@terpmail.umd.edu:

go version go1.3.1 darwin/amd64

The following snippet illustrates the problem I'm encountering:
http://play.golang.org/p/7qCY_H5pnN
Another example: http://play.golang.org/p/5Jt-wqnlNT

What happened?

If you try to marshal / unmarshal a sha1 hash ([]byte) cast to a string, you don't get
the same string out as you put in.

What should have happened instead?

Ideally, you should get the same string out as you put in. If that turns out to be
impossible for some reason, maybe make the Marshal function return an error for strings
it can't handle?

Additional

You guys probably don't need this, but I tried the following as a sanity check for
myself on what it means to cast from []byte to string in go:
http://play.golang.org/p/9n7GLU9R14
@ianlancetaylor
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Comment 1:

This behaviour, while sometimes annoying, is working as intended and is documented on
tip: "String values encode as JSON strings coerced to valid UTF-8, replacing invalid
bytes with the Unicode replacement rune."  To use random bytes as a JSON string, you
need to convert them to hex, for example, modifying your first test case as
http://play.golang.org/p/qrpMkJC8Mb .

Status changed to WorkingAsIntended.

@gopherbot
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Comment 2 by slunk@terpmail.umd.edu:

Ah, okay. Thanks for the quick response and sorry for the spurious report.

@golang golang locked and limited conversation to collaborators Jun 25, 2016
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