Doesn't seem dubious to me. I would expect it to be removed (or at least have the utf8 alias changed to point to utf8mb4) in the next major release. utf8mb3 was deprecated in the most recent release series (MySQL 8). For feature deprecation notices, MySQL consistently follows a pattern of deprecate in major release N --> remove/change in major release N+1.
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Doesn't seem dubious to me. I would expect it to be removed (or at least have the utf8 alias changed to point to utf8mb4) in the next major release. utf8mb3 was deprecated in the most recent release series (MySQL 8). For feature deprecation notices, MySQL consistently follows a pattern of deprecate in major release N --> remove/change in major release N+1.