brianmario/mysql2 — pull request #232 by tmtm (2011-12-21 03:44:01+00:00)
Title: utf8mb4 charset supoprt

The "utf8" charset of MySQL does not supports 4 bytes UTF-8 character.
The "utf8mb4" charset is needed for 4 bytes UTF-8 character. but mysql2 library didn't support it.
I added utf8mb4 charset to mysql2.