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This reverts commit 78ab944cd4b9977732becd9d0bc83223b88af9a2. After I had committed eb0d0d2c7 and 78ab944cd, I decided to add a sanity check for a "can't happen" scenario just to be cautious. It turned out that it already happened in the official Unicode source data, namely that a character can be both wide and a combining character. This fact renders the aforementioned commits unnecessary, so revert both of them. Discussion: https://www.postgresql.org/message-id/CAFBsxsH5ejH4-1xaTLpSK8vWoK1m6fA1JBtTM6jmBsLfmDki1g%40mail.gmail.com