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Clarify how additive changes are handled #455

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Apr 20, 2023
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Clarify how additive changes are handled #455

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13 changes: 13 additions & 0 deletions README.md
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Expand Up @@ -66,6 +66,19 @@ The following changes are allowed:
Note that none of the above allowed changes affects the binary wire representation or the
JSON wire representation.

The following additive changes are allowed:

- Adding new fields to existing messages.
- Adding new messages or enums.
- Adding new choices to existing enums.
- Adding new choices to existing oneof fields.
- Adding new services.
- Adding new methods to existing services.

All the additive changes above must be accompanied by an explanation about how
new and old senders and receivers that implement the version of the protocol
before and after the change interoperate.

No guarantees are provided whatsoever about the stability of the code that
is generated from the .proto files by any particular code generator.

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