Magento 2 Stores Get Boost with Smooth UTF8MB4 Migration

A customer signed up with an emoji in their display name, and the row saved with everything after the emoji chopped off. No error in the log. The column was utf8, and in MySQL utf8 has never been real UTF-8. utf8 is a three-byte lie MySQL's utf8 is an alias for utf8mb3: at most three bytes per chara