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Add application note for explicit presence tracking. - #7390
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This includes instructions for enabling explicit presence tracking in proto3, and also explains implicit presence. The language examples were written by inspection, and not individually tested.
haberman
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Apr 20, 2020
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I haven't been able to get through all of this yet, but a few preliminary comments.
haberman
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Apr 23, 2020
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Thanks for the update! I went through the rest of the doc and found a few more things.
- noted experimental status in release 3.12 - clarified JSON null and ordering concerns - "implicit presence" -> "no presence" - clarified message presence in proto3 - fixed round-trip example (client definitions were switched)
haberman
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Apr 23, 2020
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Singular, non-message typed fields in proto3 experimentally support explicit presence tracking (see docs/field_presence.md for details).