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Here is the bugs in the utf-16 decoder:
1. `aligned_end` is not updated after calling error handler.
2. Possible silent reading of one byte over the bytes array limit when decoding of a surrogate pair. b'\xD8\x00\xDC'.decode('utf-16be')
3. Error handlers receive data without last byte.
4. After handling truncate data error it is impossible to continue decoding (unlike all the other decoders).