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mysql: bump charset to to 'utf8mb4' to get full UTF-8 support
We used to use 'utf8', but in MySQL, this is just an alias for 'utf8mb3' which
isn't full unicode. 'utf8mb4' has less surprises (especially if used with the
'utf8mb4_unicode_ci' collation).
MySQL character sets for server, database, tables, and connection are set
independently. Until now, we have specified 'utf8' when creating tables to
overrule the database charset and in the default MySQL connection URL.
For existing databases, it is recommended to change encoding (and collation) by
altering the each of the tables inside it as described on
https://stackoverflow.com/questions/6115612/how-to-convert-an-entire-mysql-database-characterset-and-collation-to-utf-8 .
We used to use 'utf8', but in MySQL, this is just an alias for 'utf8mb3' which
isn't full unicode. 'utf8mb4' has less surprises (especially if used with the
'utf8mb4_unicode_ci' collation).
MySQL character sets for server, database, tables, and connection are set
independently. Until now, we have specified 'utf8' when creating tables to
overrule the database charset and in the default MySQL connection URL.
For existing databases, it is recommended to change encoding (and collation) by
altering the each of the tables inside it as described on
https://stackoverflow.com/questions/6115612/how-to-convert-an-entire-mysql-database-characterset-and-collation-to-utf-8 .