Hebrew letters "weigh" twice as much as English ones

Hebrew letters apparently count twice (each letter counts as two). Probably due to the way UTF-8 encoding works.

After submission I often get a message saying my update was too long. The counter is correct though. A 71-letter tweet returned an error msg.

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Testers: some Hebrew to play around with: ם ס ו
(that's in case you want to try testing the problem but can't type in Hebrew; letters should come out as a square, a circle and a line if you use the right encoding)