Changes announced April 28, 2023

Stricter validation for json_name

v24 will forbid embedded null characters in the json_name field option. Going forward, any valid Unicode characters will be accepted, except \u0000. Null will still be allowed in field values.

Previously, the proto compiler allowed null characters, but support for this was inconsistent across languages and implementations. To fix this, we are clarifying the spec to say that null is not allowed in json_name, and will be rejected by the compiler.