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In 9.2, Unicode escape sequences are not analysed at all other than to make sure that they are in the form \uXXXX. But in 9.3 many of the new operators and functions try to turn JSON text values into text in the server encoding, and this includes de-escaping Unicode escape sequences. This processing had not taken into account the possibility that this might contain a surrogate pair to designate a character outside the BMP. That is now handled correctly. This also enforces correct use of surrogate pairs, something that is not done by the type's input routines. This fact is noted in the docs. |
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