encoding/json/v2: remove `unknown` tag option and DiscardUnknownMembers WARNING: This commit contains breaking changes for those already using GOEXPERIMENT=jsonv2. This removes support for the `unknown` tag option and the DiscardUnknownMembers marshal option. The `unknown` tag option semantics are a bit too subtle even for experienced Go programmers to understand. Remove support for it. The exact same feature (or something similar) can be added back into a future release of json/v2. We already support the `inline` tag option, which can handle most cases of what someone might want to do with unknown fields (such as preserve them). Fixes #77271 Updates #76444 Change-Id: I875952f0755e58aac4c571869b2cdb56e75cfda9 Reviewed-on: https://go-review.googlesource.com/c/go/+/741320 Reviewed-by: Damien Neil <dneil@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com>
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