"Optional" fields, as in fields you can tell if they were explicitly set or not, were re-introduced. Depending on your definition either required fields were not reintroduced, or required fields with a mandatory default value were until recently the only kind of field in proto3.
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"Optional" fields, as in fields you can tell if they were explicitly set or not, were re-introduced. Depending on your definition either required fields were not reintroduced, or required fields with a mandatory default value were until recently the only kind of field in proto3.