Protobuf Practice

Edit the schema, wait for the descriptor checks, and continue when everything passes.

Progress

6. Field Presence

Context

In proto3 a scalar at its default value is omitted from the wire, so a receiver cannot tell false from unset. Explicit presence fixes that.

Task

Add explicit field presence tracking to the is_admin field.

schema.proto

Valid Schema

syntax = "proto3";

package practice;

message UserSession {
  string username = 1;
  bool is_admin = 2;
}

EVALUATION_CHECKS

Field 'is_admin' uses the 'optional' keyword for presence.

Please satisfy all checks above

Write practical schemas with messages, fields, and types.

Evolve messages without breaking deployed systems.

Decode wire-format bytes one field at a time.