encoding/json/v2: report error when unmarshaling into ambiguous set of fields When MatchCaseInsensitiveNames is specified, an incoming JSON name may match multiple Go struct fields to prospectively unmarshal into. The v1 default behavior is to select the first field declared. This change makes it such that the v2 default is to report an error if multiple candidate fields exist. The ReportErrorsWithLegacySemantics options opts into v1 behavior. Updates #79733 Change-Id: Idcfca4fe0a21c7675c61ee836c51da1b1a719c7b Reviewed-on: https://go-review.googlesource.com/c/go/+/792780 Reviewed-by: Damien Neil <dneil@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com>
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