</span></span></code></pre></div><h2 id=
cheat>Cheat sheet
</h2><p><strong>Proto2:
</strong></p><p>Is field presence tracked?
</p><table><thead><tr><th>Field type
</th><th>Tracked?
</th></tr></thead><tbody><tr><td>Singular field
</td><td>yes
</td></tr><tr><td>Singular message field
</td><td>yes
</td></tr><tr><td>Field in a oneof
</td><td>yes
</td></tr><tr><td>Repeated field & map
</td><td>no
</td></tr></tbody></table><p><strong>Proto3:
</strong></p><p>Is field presence tracked?
</p><table><thead><tr><th>Field type
</th><th>Tracked?
</th></tr></thead><tbody><tr><td>Singular message field
</td><td>yes
</td></tr><tr><td>Field in a oneof
</td><td>yes
</td></tr><tr><td><em>Other
</em> singular field
</td><td>if defined as
<code>optional
</code></td></tr><tr><td>Repeated field & map
</td><td>no
</td></tr></tbody></table><p><strong>Edition 2023:
</strong></p><p>Is field presence tracked?
</p><table><thead><tr><th>Field type
</th><th>Tracked?
</th></tr></thead><tbody><tr><td>Default
</td><td>yes
</td></tr><tr><td><code>features.field_presence
</code> set to
<code>LEGACY_REQUIRED
</code></td><td>yes
</td></tr><tr><td><code>features.field_presence
</code> set to
<code>IMPLICIT
</code></td><td>no
</td></tr><tr><td>Repeated field & map
</td><td>no
</td></tr></tbody></table></div></main></div></div><footer class="
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