Currently `persistent-mysql` has `utf8` hard coded for text values but that encoding is valid only for Basic Muplilanguage Plane, see e.g. https://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.html Shouldn't it be changed to `utf8mb4` instead? That would be not backwards compatible change so it should be properly announced I suppose.