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A comment on Why Uber Engineering Switched from Postgres to MySQL (2016). Parent comment

Re:Why Uber Engineering Switched from Postgres to MySQL (2016) by Alexendoo on Saturday February 27, 2021 @10:00AM (#26285240)
uft8mb4 does not use more bytes than utf8mb3, for anything representable by utf8mb3 the size in uft8mb4 is identical. Anything that would be 4 bytes in uft8mb4 is not able to be stored in utf8mb3

utf8mb3 is definitely a broken subset, it's deprecated at the very least

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