> "Once MySQL published this invalid character set, it could never fix it: that would force every user to rebuild every database. MySQL finally released UTF-8 s

> "Once MySQL published this invalid character set, it could never fix it: that would force every user to rebuild every database. MySQL finally released UTF-8 support in 2010, with a different name: “utf8mb4”." Had MySQL defined UTF-8 as up to 6 bytes initially, would they later force users to rebuilt their databases when UTF-8 was redefined to only 4 bytes?