Change-Id: Id47a99eafd700576f84f31f5f1b585c7aef8b0b4
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/636676
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Chressie Himpel <chressie@google.com>

Currently, Go Protobuf requires Go 1.21.

Change-Id: I0b923f4f7732d54628f84e93adccc12f74f14e8e
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/637475
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Chressie Himpel <chressie@google.com>
Auto-Submit: Michael Stapelberg <stapelberg@google.com>

This reverts change https://go.dev/cl/632735, in which
I misunderstood what the Protobuf documentation wanted to convey:
The quoted docs in CL 632735 refer to reflection for proto3 optional
fields, not to reflection for proto3 synthetic oneofs.

Synthetic oneofs should remain visible through reflection.
For the Open API, this change restores the old behavior.
For the Opaque API, another fix is needed and will be sent
in a separate, follow-up CL (follow golang/protobuf#1659).

For golang/protobuf#1659

Thanks to Joshua Humphries for the report and reproducer!

Change-Id: I3a924eed6d2425581adc65651395a68fc1576f4d
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/638495
Reviewed-by: Chressie Himpel <chressie@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

Change-Id: I551d270a4c0010bcdc87056715a1c38271ca2f5c
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/637937
Reviewed-by: Chressie Himpel <chressie@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>