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1. Define behavior for Unmarshal of JSON null into Unmarshaler and TextUnmarshaler. Specifically, an Unmarshaler will be given the literal null and can decide what to do (because otherwise json.RawMessage is impossible to implement), and a TextUnmarshaler will be skipped over (because there is no text to unmarshal), like most other inappropriate types. Document this in Unmarshal, with a reminder in UnmarshalJSON about handling null. 2. Test all this. 3. Fix the TextUnmarshaler case, which was returning an unmarshalling error, to match the definition. 4. Fix the error that had been used for the TextUnmarshaler, since it was claiming that there was a JSON string when in fact the problem was NOT having a string. 5. Adjust time.Time and big.Int's UnmarshalJSON to ignore null, as is conventional. Fixes #9037. Change-Id: If78350414eb8dda712867dc8f4ca35a9db041b0c Reviewed-on: https://go-review.googlesource.com/30944 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> |
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